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Dear Colleagues, I have received the following request. If anyone can held Victor Gil would they respond to him directly. All good wishes, Olive Olive Goddard Centre and Editorial Manager Centre for Evidence-Based Medicine Department of Primary Health Care Old Road Campus, Headington Oxford, OX3 7LF ..................................................................... Tel: +44 (0)1865 226991 email: [log in to unmask] Fax: +44 (0)1865 226845 web: www.cebm.net Mobile: 0773 484 2403 web: www.cebmh.com >>> "Victor M. Gil" <[log in to unmask]> 01/29/06 2:57 am >>> Dear Olive I need references about the backgroud for surveys and registries and their relationship to RCT; also, about types and methodologic issues of registries and surveys. Can you help me? Thanks and kind regards Victor Gil