Research

PUBLICATIONS: 

Peer-reviewed publications

1.       Jiao, Boshen, Ryoko Sato, Joshua Mak, Bryan Patenaude Margaret de Villiers, Aniruddha Deshpande, Ivane Gamkrelidze, Katy A.M. Gaythorpe, Timothy B. Hallett, Mark Jit, Xiang Li, Benjamin Lopman, Shevanthi Nayagam, Devin Razavi-Shearer, Yvonne Tam, Kim H Woodruff, Daniel Hogan, Tewodaj Mengistu, Stéphane Verguet “Vaccine-mediated financial risk protection in 52 Gavi-eligible low- and middle-income countries: A modeling study” accepted at PLOS Medicine

2.       Nguyen, Vi, Ryoko Sato, Jeffrey Loh-Doyle, William Brant, Sirikan Rojanasarot, Santosh Telang, Tung-Chin Hsieh “Infection Following Inflatable Penile Prosthesis Placement: A Real-World Comparison of Device Selection and Patient Characteristics” accepted at  Translational Andrology and Urology

3.        Secemsky, Eric, Ryoko Sato, Abimbola O. Williams, Alexander C. Fanaroff, Sue Duval, Michael R. Jaff, Alexandra Greenberg-Worisek, Jay Gir, Wendy Wifler, Peter Monteleone “Interplay of Race and Community Characteristics on Health Disparities among Medicare Beneficiaries with Peripheral Artery Disease” accepted at The American Journal of Cardiology

4.       Yu, James B, Ryoko Sato, Michael R Folkert, Samir Bhattacharyya, Emmanuel Ezekekwu, Daniel A. Hamstra “Rectal Spacer Use and Overall Long-Term Healthcare Costs: Payer Perspective” accepted at Frontiers in Oncology, Radiation Oncology

5.       Long, Jaime B, Krista Reagan, Ryoko Sato, Shunaha Kim-Fine, Kristen A. Gerjevic, Sarah Boyd, Olubiyi Aworunse, Cara L. Grimes “Socioeconomic, Demographic, and Provider Determinants of Staged vs. Concomitant Surgery for Pelvic Organ Prolapse and Stress Urinary Incontinence” accepted at Journal of Clinical Gynecology & Obstetrics

6.       Yu, James B, Michael R Folkert, Ryoko Sato, Sean Collins, Ryan Hankins, Parthiv Mehta, Samir Bhattacharyya, Emmanuel Ezekekwu, Daniel A. Hamstra “Rectal Spacer Use and Bowel, Urinary, and Sexual Dysfunction Diagnosis and Related Procedures among Men Receiving Prostate Radiotherapy: U.S County-level Analysis” World Journal of Urology, 43, no. 1 (2025): 417

7.       Shaw Nathan, Ryoko Sato, Sirikan Rojanasarot, Paul Rusilko “Quantifying the Number of US Males with Incident Persistent Stress Urinary Incontinence” Journal of Urology Open Plus, 3 no. 7 (2025): e00071

8.       Verguet, Stéphane, Dominick Villano, Boshen Jiao, Sarah Bolongaita, Isabelle Iversen, Ryoko Sato, Mieraf Taddesse Tolla, Solomon Tessema Memirie “Inequalities in diarrhea, pneumonia, and measles deaths in sub-Saharan Africa: estimates for 21 countries drawing from the Demographic and Health Surveys” accepted at Bulletin of the World Health Organization

9.       Nguyen, Vi, Ryoko Sato, Jeffrey Loh-Doyle, William Brant, Sirikan Rojanasarot, Santosh Telang, Tung-Chin Hsieh “A Nationwide Analysis of Post-Penile Prosthesis Infection: Do Hospital and Surgeon Volume Matter?” Urology, 201 (2025): 159-166

10.   Turbey, Benjamin, Jean-Nicolas Cornu, Peter Schatteman, Christian Wetterauer, Laura Bruno, Clementine Demaire, Ryoko Sato, Ilaria Bozzari, Laura Vincenzi, and Ivan Schwartzmann. “Evolution of the Endoscopic Surgical Approach for Benign Prostatic Obstruction in European Countries” European Urology Focus, 3 (2025): S2405-4569(25)00070-7

11.   Andino, Juan, Navid Leelani, Ryoko Sato, Young Shin, Sirikan Rojanasarot, Thiago Furtado, Helen L Bernie, Petar Bajic, Carolyn A Salter, Joshua A. Halpern. “Association between Surgeon Procedure Volume and Reoperation Rates for Penile Prosthesis Implantation” Journal of Sexual Medicine, 22, no. 5 (2025): 916-923

12.   Monga, Manoj, Ryoko Sato, Jenifer White, Shefali Mehendale, Mohammed Boulmani, Harshini Mashruwala, Olivier Traxer. “Risk Factors for Adverse Outcomes Following Ureteroscopy for Stone Management in US Medicare Patients” Urology, 199 (2025): 54-61

13.   Sato, Ryoko*. “Closing the Gap on Vaccine Uptake in Developing Countries: Is There a Role for Cash Incentives?” Vaccine 48 (2025): 126763

14.   Folkert, Michael R., Ryoko Sato, James B. Yu, Danielle Vannan, Samir Bhattacharyya, Carrie Noriega, Daniel Hamstra, “Reduced Bowel Disorders with Rectal Spacer in Real-World Prostate Cancer Patients with Radiotherapy” JAMA Network Open, 8(3) (2025): e250491-e250491

15.   Resch, Stephen C., Ryoko Sato, Kevin Phelan, Cécile Cazes, Abdramane Ombotimbe, Victoire Hubert, Harouna Boubacar et al. "Cost-effectiveness of a simplified acute malnutrition program: a secondary analysis of the OptiMA randomized clinical trial in the Democratic Republic of the Congo." Health Policy and Planning 40, no. 3 (2024): 273-286.

16.   Sato, Ryoko* “Trends of 2nd Measles Vaccine (MCV2) over time after its launch as part of Routine Immunization (RI) in Nigeria: Brief Research Report” Frontiers in Public Health, 12 (2024): 1392996

17.   Williams, Jeffrey L., Ryoko Sato, and Caroline M. Jacobsen. "Cost Savings Associated with Extended Battery Longevity in Cardiac Resynchronization Therapy Defibrillators (CRT-D)." Heart Rhythm O2, 5(11) (2024): 755-761.

18.    Kadian-Dodov, Daniella, Abimbola O. Williams, Ryoko Sato, Luckyboy Vang, and Michael R. Jaff. "Trends in the Utilization of Drug-Eluting Stents to Treat Femoropopliteal Peripheral Artery Disease." JVS-Vascular Insights (2024): 100136.

19.   Tesfaye, Latera, Tom Forzy, Fentabil Getnet, Awoke Misganaw, Mesfin Agachew Woldekidan, Asrat Arja Wolde, Samson Warkaye,… Ryoko Sato, et al. "Estimating immunization coverage at the district level: A case study of measles and diphtheria-pertussis-tetanus-Hib-HepB vaccines in Ethiopia." PLOS Global Public Health 4, no. 7 (2024): e0003404.

20.   Jiao, Boshen, Isabelle Iversen, Ryoko Sato, Clint Pecenka, Sadaf Khan, Ranju Baral, Margaret E Kruk, Catherine Arsenault, and Stéphane Verguet.” Association between achieving adequate antenatal care and health-seeking behaviors: A study of Demographic and Health Surveys in 47 low- and middle-income countries” PLoS Medicine 21, no. 7 (2024): e1004421

21.   Sato, Ryoko*. “How did the introduction of the measles-containing vaccine second dose (MCV2) affect measles vaccine uptake? – Evidence from Nigeria” Human Vaccines & Immunotherapeutics 20, no. 1 (2024): 2355036.

22.   Lee, Yeeun, Sarah Bolongaita, Ryoko Sato, Jesse B. Bump, and Stéphane Verguet. "Evolution in key indicators of maternal and child health across the wealth gradient in 41 sub-Saharan African countries, 1986–2019." BMC Medicine 22, no. 1 (2024): 1-12.

23.   Sato, Ryoko*, Loveth Metiboba, Jamil Aliyu Galadanchi, Mohammed-Faosy Ademiran, Saqid Haruna Hassan, David Akpan, Juliet Odogwu, Busayo Fashoto “Cost analysis of an innovative eHealth program in Nigeria: A case study of Vaccine Direct Delivery System” BMC Public Health 23, no. 1 (2023): 1691.

24.   Kamei, Akito, Rebecca Thornton, and Ryoko Sato “Factors associated with knowledge and use of home pregnancy test kits in Uganda” PLOS Global Public Health 3, no. 7 (2023): e0002165.

25.   Sato, Ryoko*. “Revisiting the measurement of vaccine hesitancy: Comparison between routine immunization and supplementary immunization activity in Nigeria” Vaccine 41, no. 32 (2023): 4633-4635

26.   Emmanuel Olamijuwon, Olusesan Makinde, Ifeanyi Mgbachi, and Ryoko Sato “Childhood exposure to armed conflict and nutritional health outcomes in Nigeria” Conflict and Health 17, no. 1 (2023): 15

27.   Sato, Ryoko*. “Vaccine Hesitancy against COVID-19 Vaccine over time in Nigeria” Vaccine 41, no. 17 (2023): 2749-2753.

28.   Solomon Memirie, Ryoko Sato “Out-of-pocket expenditures and financial risks associated with treatment of vaccine-preventable diseases in Ethiopia”, Plos Medicine 20, no. 3 (2023): e1004198

29.   Sato, Ryoko*. “Zero-dose, under-immunized, and dropout children in Nigeria: Trend and its contributing factors over time” Vaccines 11, no. 1 (2023): 181

30.   Sato, Ryoko*, Sarah Bolongaita, Solomon Tessema Memirie, Kenneth Harttgen, Jan-Walter De Neve, and Stéphane Verguet. “Joint distribution of child mortality and wealth across 30 sub-Saharan African countries over 2000-2019”  Journal of Global Health 13 (2023)

31.   Sato, Ryoko*. “Geospatial and Time Trend of Prevalence and Characteristics of Zero-Dose Children in Nigeria from 2003 to 2018” Vaccines 10, no. 9 (2022): 1556

32.   Nathaniel Hendrix, Samson Warkaye, Latera Tesfaye, Mesfin Agachew Woldekidan, Asrat Arja, Ryoko Sato, Solomon Tessema Memirie, Alemnesh H. Mirkuzie, Fentabil Getnet, Stéphane Verguet “Estimated Travel Time and Staffing Constraints to Accessing the Ethiopian Healthcare System: A Two-Step Floating Catchment Area Analysis” Journal of global health 13 (2023).

33.   Sato, Ryoko*, Olusesan Makinder, Koeloengan Clement Daam, Bola Lawal. “Geographical and time trends of measles incidence and measles vaccination coverage and their correlation in Nigeria” Human Vaccines & Immunotherapeutics 18, no. 6 (2022): 2114697

34.   Bolongaita, Sarah, Domonick Villano, Solomon Memirie, Mizan Mirutse, Alemnesh Mirkuzie, Sophia Comas, Eva Rumpler, Stephanie Wu, Ryoko Sato, Angela Chang, Stephane Verguet. “Modeling the relative risk of incidence and mortality of select vaccine-preventable diseases by wealth group and geographic region in Ethiopia”, PLOS global public health 2, no. 8 (2022): e0000819.

35.   Sato, Ryoko*, Julian Jamison, Kevin McGee, Gbemisola Oseni, Julie Perng, Tomomi Tanaka (2022) “The relationships between adverse life events, depression, economic activities, and human capital investment in Nigeria”, Medicine, Conflict and Survival 38, no. 3 (2022): 170-183.

36.   Sato, Ryoko* (2022) “COVID-19 Vaccine Hesitancy and Trust in Government in Nigeria”, Vaccines 10, no. 7 (2022): 1008.

37.   Sato, Ryoko* (2022) “Evaluation of catastrophic health expenditure risk due to measles in Nigeria”, Human Vaccines & Immunotherapeutics 18, no. 5 (2022): 2065836

38.   Sato, Ryoko* (2022) “Catastrophic health expenditure and its determinants among Nigerian households”, International Journal of Health Economics and Management 22, no. 4 (2022): 459-470.

39.   Sato, Ryoko* and Masahiko Haraguchi. (2021) “Effect of measles prevalence and vaccination coverage on other disease burden: Evidence of measles immune amnesia in 46 African countries”, Human Vaccines & Immunotherapeutics, 17(12): 5361-5366

40.   Sato, Ryoko*. (2022) “Malnutrition and the Risk of Catastrophic Health Expenditure in Nigeria”, Global Journal of Health Science, 14(1): 36-42

41.   Kamei, Akito, Ryoko Sato, Rebecca Thornton. (2021) “Effect of Pregnancy Tests on Demand for Family Planning: Evidence from a Randomized Controlled Trial in Uganda”, Reproductive Health, 18(231)

42.   Sato, Ryoko*, Maguy Daures, Kevin Phelan, Susan Shepherd, Moumouni Kinda, Renaud Becquet, Robert Hecht, Stephen Resch (2022) “Utilization patterns, outcomes, and costs of a simplified acute malnutrition treatment program in Burkina Faso”, Maternal & Child Nutrition, 18(2):e13291

43.   Sato, Ryoko* and Yoshito Takasaki. (2021) “Vaccine Hesitancy and Refusal: Behavioral Evidence from Rural Northern Nigeria”, Vaccines, 9(9):1023

44.   Sato, Ryoko * (2021) “Differential effect of conflicts on vaccination: Boko Haram insurgency vs. other conflicts in Nigeria”, Medicine, Conflict and Survival, 37(4): 275-292

45.   Sato, Ryoko* and Titus Tenense. (2021) "Effect of tailored information of vaccination schedule on vaccine uptake in northern Nigeria" Human Vaccines & Immunotherapeutics, 17(1): 3818-3822

46.   Catherine Yeung, Teck-Hua Ho, Ryoko Sato, Noah Lim, Rob M. van Dam, Hong-Chang Tan, Kwang-Wei Tham, Rehan Ali. (2021) "Cash Incentives for Weight Loss Work Only for Males" Behavioural Public Policy, 1-21

47.   Sato, Ryoko* (2021) “Pattern of Vaccination Delivery around COVID-19 lockdown in Nigeria”, Human Vaccines & Immunotherapeutics, 17(9): 2951-2953

48.   Sato, Ryoko*, Julia Rohr, Sarah Huber, Yilmaz Esmer, Bahar Ayça Okçuoğlu, Duygu Karadon, Iqbal Shah and David Canning. (2021) “Effect of distance to health facilities and access to contraceptive services among urban Turkish women” The European Journal of Contraceptive and Reproductive Health Care, 6(5):374-382

49.   Michael J. Mahande, Ryoko Sato, Caroline Amour, Rachel Manongi, Amina Farah, Sia E Msuya, Bilikisu Elewonibi, Iqbal Shah. (2021) “Predictors of contraceptive discontinuation among postpartum women in Arusha Region, Tanzania” Contraception and Reproductive Medicine, 6(1): 1-9

50.   Sato, Ryoko* and Y. Takasaki (2021) “Advantages and Disadvantages of Institutional Delivery and Home Delivery: Qualitative Study among Northern Nigerian women” European Journal of Preventive Medicine, 9(1): 19-24

51.   Olivier Drouin, Ryoko Sato, Jeremy E. Drehmer, Emara Nabi-Burza, Bethany Hipple Walters, Jonathan P. Winickoff, Douglas E. Levy (2021) "Cost-effectiveness of a smoking cessation intervention for parents in pediatric primary care" JAMA Network Open, 4(4), e213927

52.   Sato, Ryoko* (2021) "Association between uptake of selected vaccines and undernutrition among Nigerian children" Human Vaccines & Immunotherapeutics, 17(8):2630-2638

53.   Sato, Ryoko*, Adam Thompson, Ibrahim Sani, Loveth Metiboba, Aisha Giwa, Olufunke Femi-Ojo, Vivian Odezugo (2021) "Effect of Vaccine Direct Delivery (VDD) on Vaccine Stockouts and Number of Vaccinations: Case Study from Bauchi State, Nigeria" Vaccine, 39(9): 1445-1451

54.   Sato, Ryoko* (2021) “Gender Differences in Perceptions of Family Planning and Fertility Preferences in Northern Nigeria” Journal of Gynecology and Women’s Health, Volume 20 Issue 4

55.   Sato, Ryoko* and Bilikisu Elewonibi (2021) “Demand for Information on Family Planning among Married Women and Men in Northern Nigeria” Journal of Gynecology and Women’s Health, 20(4): 556042

56.   Ayaga A. Bawah, Ryoko Sato, Patrick Asuming, Elizabeth G. Henry, Caesar Agula, Charles Agyei-Asabere, David Canning, Iqbal Shah. (2021) “Contraceptive method use, discontinuation and failure rates among women aged 15-49 years: evidence from selected low income settings in Kumasi, Ghana” Contraception and Reproductive Medicine, 6(1): 1-10

57.   Sebahat Kurutaş, Ryoko Sato, Ayça Okçuoğlu, Sarah Huber-Krum, Navdep Kaur, Julia Rohr, Simay Baykal, Yilmaz Esmer, Duygu Karadon, Iqbal Shah, David Canning (2021) “Contraceptive discontinuation and switching in urban Istanbul region in Turkey” International Journal of Gynecology & Obstetrics, 154(1): 133-141

58.   Skoufias, Emmanuel, Katja Vinha, and Ryoko Sato (2021) “Reducing Stunting through Multisectoral Efforts in Sub-Saharan Africa”, Journal of African Economies, 30(4): 324-348

59.   Sato, Ryoko* and Yoshito Takasaki (2020) “Backfire Effect of Salient Information on Vaccine Take-up Experimental Evidence from Scared-Straight Intervention in Rural Northern Nigeria”, Human Vaccines & Immunotherapeutics, 17(6): 1703-1713

60.   Kristy Hackett, Elizabeth Henry, Imtiaz Hussain, Mirbaz Khan, Khalid Feroz, Navdep Kaur, Ryoko Sato, Sajid Soofi, David Canning, Iqbal Shah. (2020) “Impact of home-based family planning counselling and referral on modern contraceptive use in Karachi, Pakistan: a retrospective, cross-sectional matched control study” BMJ Open, 10(9), e039835

61.   Mahesh Karra, David Canning, and Ryoko Sato. (2020) “Adding Measurement Error to Location Data to Protect Subject Confidentiality While Allowing Consistent Estimation of Exposure Effects” Journal of the Royal Statistical Society, 69(5) :  1251-1268

62.   Sato, Ryoko* and Abdullahi Belel (2021) “Effect of Performance-Based Financing on Health Service Delivery: A case study from Adamawa State, Nigeria”, International Health, 13(2) : 122-129

63.   Elewonibi, Bilikisu*, Ryoko Sato, Rachel Manongi, Sia Msuya, Iqbal Shah, and David Canning. (2020) "The distance-quality trade-off in women’s choice of family planning provider in North Eastern Tanzania." BMJ Global Health 5, no. 2.

64.   Sato, Ryoko* and Benjamin Fintan. (2020) “Women’s Understanding of Immunization Card and Its Correlation with Vaccination Behaviors” Human Vaccines & Immunotherapeutics, 16(10):2408-2414

65.   Sato, Ryoko*. (2020) “Fear, Knowledge, and Vaccination Behaviors among Women in Northern Nigeria” Human Vaccines & Immunotherapeutics, 16(10):2438-2448

66.   Sato, Ryoko*, Bilikisu Elewonibi, Sia Msuya, Rachel Manongi, David Canning, Iqbal Shah (2020) “Why do women discontinue contraception and what are the post-discontinuation outcomes? Evidence from Arusha Region, Tanzania”, Sexual and Reproductive Health Matters, 28(1), 1723321

67.   Sato, Ryoko* and Abdullahi Belel (2020) “The Effect of Performance-Based Financing on Child Vaccinations in Northern Nigeria”, Vaccine, 38(9): 2209-2215

68.   Sato, Ryoko*. (2020) “Differential determinants and reasons for the non- and partial vaccination of children among Nigerian caregivers” Vaccine 38(1): 63-69

69.   Sato, Ryoko*. (2019) “Effect of Armed Conflict on Vaccination: Evidence from the Boko Haram Insurgency in Northeastern Nigeria” Conflict and Health, 13:49

70.   Sato, Ryoko*. (2019) “Association between Access to Health Facility and Continuum of Vaccination Behaviors among Nigerian Children” Human Vaccines & Immunotherapeutics, Volume 16 Issue 5: 1-6.

71.   Sato, Ryoko* and Benjamin Fintan (2019) “Effect of cash incentives on tetanus toxoid vaccination among rural Nigerian women: a randomized controlled trial” Human Vaccines & Immunotherapeutics, Volume 16 Issue 4, 1-8

72.   Sato, Ryoko*. (2019) “Vaccine Stockouts and Vaccination Rate: Examination of Unique Administrative Data from Nigeria” International Health, 12(3):170-176

73.   Sato, Ryoko*. (2019) “Relationship Between Vaccine Stockouts And Vaccination Rate: Examination of Unique Administrative Data from Nigeria” Journal of Vaccines & Vaccination, 10:405

74.   Sato, Ryoko*. (2019) “Quality and Quantity of Health Clinics, and Their Impacts on Health Behaviors and Outcomes: Analysis of Health Facility Census in Nigeria” BMC: Health Services Research 19:377

75.   Sato, Ryoko*. (2019) “Psychological Barrier to Tetanus-Toxoid Vaccination among Nigerian Women” Journal of Vaccines & Vaccination, 10(1)397

76.   Sato, Ryoko* and Yoshito Takasaki (2019) “Peer Effects on Vaccination Behavior: Experimental Evidence from Rural Nigeria” Economic Development and Cultural Change, 68(1), 93-129

77.   Sato, Ryoko*. and Yoshito Takasaki (2019) “Psychic vs. Economic Barriers to Vaccine Take-up: Evidence from a Field Experiment in Nigeria” The World Bank Economic Review, 33(3), 622-642

78.   Sato, Ryoko*. (2017) “Learning from a Bitter Past? Behavioral Effect of Child’s Death on Mothers” Journal of African Economies, 26(4) 470-491

Non-peer reviewed publications

Book

Yilmaz Esmer (Editor) Culture, Politics, Ideology and Reproductive Health in Turkey. Chapter 8

Skoufias, Emmanuel, Katja Vinha, and Ryoko Sato. 2019. All Hands on Deck: Reducing Stunting through Multisectoral Efforts in Sub-Saharan Africa. Africa Development Forum series. Washington, DC: World Bank. doi:10.1596/978-1-4648-1396-2. License: Creative Commons Attribution CC BY 3.0 IGO https://openknowledge.worldbank.org/bitstream/handle/10986/32037/9781464813962.pdf 

Report

World Bank. 2022. The World Bank’s Early Support to Addressing COVID-19. Health and Social Response (An Early-Stage Evaluation) https://ieg.worldbankgroup.org/evaluations/world-banks-early-support-addressing-covid-19

World Bank. 2021. World Bank Support to Reducing Child Undernutrition. Independent Evaluation Group. Washington, DC: World Bank. https://ieg.worldbankgroup.org/sites/default/files/Data/Evaluation/files/Undernutrition.pdf

World Bank. 2018. Poverty Trends in Ghana 2005-2017, Ghana Living Standards Survey Round 7 (GLSS7)http://www2.statsghana.gov.gh/docfiles/publications/GLSS7/Poverty%20Profile%20Report_2005%20-%202017.pdf