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von Elm, E; Altman, DG; Egger, M; Pocock, SJ; Gotzsche, PC; Vandenbroucke, JP (2007). The "Strengthening the Reporting of Observational Studies in Epidemiology" (STROBE) statement: guidelines for reporting observational studies. Infectious diseases journal of Pakistan : IDJ, 16(4), pp. 108-12. Karachi (Pakistan): Creative Endeavors
