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Studies in Family Planning|November 1, 1993
The need for quasi-experimental methodology to evaluate pricing effectsF R León, A CuestaStudies in Family Planning|May 1, 1994
The reliability of simulated clients' quality-of-care ratingsF R León, G Quiroz, A BrazzoduroRevista De Gastroenterologia Del Peru : Organo Oficial De La Sociedad De Gastroenterologia Del Peru|January 1, 1996
[The endoscopic treatment of pancreatic pseudocyst]J Ruíz, F R León, L Pernía, et al.Pageof 1