Cainzos-Achirica M, Bilal U, Kapoor K, Quispe Ayala R, McEvoy JW, Pladevall-Vila M, Blumenthal RS, Blaha MJ. Methodological issues in nutritional epidemiology research–sorting through the confusion. Current Cardiovascular Risk Reports. 2018 Feb;12:4. doi: 10.1007/s12170-018-0567-8
Bradley RH, National Institute of Child Health and Human Development (NICHD) Early Child Care Research Network, McLeod LD. Child care and common communicable illnesses in children aged 37 to 54 months. Arch Pediatr Adolesc. 2003 Feb;157(2):196-200. doi: 10.1001/archpedi.157.2.196