Características generales del diseño

60 Guía práctica de investigación en saludSchulz KF, Grimes DA. Blinding in randomized trials: hiding who got what. Lancet,2002, 359: 696–700.Schulz KF, Grimes DA. Sample size slippages in randomized trials: exclusions and thelost and wayward. Lancet, 2002, 359: 781–85.Schulz KF, Grimes DA. Unequal group sizes in randomized trials: guarding againstguessing. Lancet, 2002, 359: 966–70.Swinscow TDV, Campbell MJ. Statistics at square one. 10th edition. Londres, BMJBooks, 2002.Ulin PR, Robinson ET, Tolley EE, McNeill ET. Qualitative methods: A field guide forapplied research in sexual and reproductive health. North Carolina, Family HealthInternational, 2002.Varkevisser C, Pathmanathan I, Brownlee. Designing and conducting health systemsresearch projects. Volume 1: Proposal development and field work. Volume 2: Dataanalysis and report writing. Ottawa, Centro de Investigaciones para el Desarrollo Internacional,1995.Wingo PA, Higgins JA, Rubin GL, Zahniser SC. An epidemiologic approach to reproductivehealth. Ginebra, Organización Mundial de la Salud, 1994 (WHO/HRP/EPI/1994).Health research methodology. A guide for training in research methods. 2nd edition.Manila, Oficina Regional de la OMS para el Pacífico Sudoriental, 2001.