1. Universidad Peruana Cayetano Heredia; Instituto de Medicina Tropical Alexander von Humboldt; Av. Honorio Delgado 430 Urb. Ingeniería S.M.P. Lima Peru 31
2. Hospital Universitario Fundación Alcorcón; Internal Medicine; Calle Budapest 1 Madrid Spain 28922
3. Hospital Nacional Cayetano Heredia; Av Honorio Delgado 350. SMP Lima Peru
4. University of Texas Medical Branch; Department of Internal Medicine; 301 University Boulevard Galveston USA TX 77555-0435
5. Hospital Ramón y Cajal; Tropical Medicine and Parasitology Unit, Infectious Disease Service; Carretera de Colmenar Km 9,100 Madrid Spain 28034
6. Clinical Biostatistics Unit. Ramón y Cajal Hospital (IRYCIS). Francisco de Vitoria University (UFV Madrid). CIBER Epidemiology and Public Health (CIBERESP); Cochrane Collaborating Centre; Carretera de Colmenar Km 9.100 Madrid Spain 28034