title: Study designs in healthcare research.
authors.affiliation: Intensive Care Department (MC 1425), King Abdul-Aziz Medical City, PO Box 22490, Riyadh 11426, Kingdom of Saudi Arabia. arabi@ngha.med.sa
authors.forename: Yaseen
authors.initials: Y
authors.lastname: Arabi
mesh_terms: D006302:Health Services Research; D006801:Humans; D012107:Research Design