title: Methodological challenges in studying long-term effects of breast-feeding.
authors.affiliation: Department of Pediatrics, McGill University Faculty of Medicine, Canada. michael.kramer@mcgill.ca
authors.forename: M S
authors.initials: MS
authors.lastname: Kramer
mesh_terms: D015982:Bias; D001942:Breast Feeding / Q000453:epidemiology* / Q000706:statistics & numerical data; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D006801:Humans; D007223:Infant; D007227:Infant Nutritional Physiological Phenomena / Q000276:immunology / Q000502:physiology*; D007231:Infant, Newborn; D008895:Milk, Human / Q000276:immunology / Q000382:microbiology / Q000502:physiology; D013997:Time Factors