Sample selection bias in adult mortality estimates from mobile phone surveys: Evidence from 25 low- and middle-income countries Tom Pullum , Julio Romero-Prieto et al.
Has contraceptive use at pregnancy an effect on the odds of spontaneous termination and induced abortion? Evidence from Demographic and Health Surveys David A. Sánchez-Páez , José Antonio Ortega
Adolescent contraceptive use and its effects on fertility David A. Sánchez-Páez , José Antonio Ortega