title: Basic study designs in health research.
authors: Department of Pediatrics and Child Health, Aga Khan University, Karachi, Pakistan.
authors: Fyezah
authors: F
authors: Jehan
authors: Abdul Momin
authors: AM
authors: Kazi
mesh_terms: D006302:Health Services Research / Q000458:organization & administration*; D006801:Humans; D012107:Research Design