1. Universidad Nacional Federico Villarreal, Lima, Peru;
2. Instituto de Medicina Tropical “Alexander von Humboldt”, Universidad Peruana Cayetano Heredia, Lima, Peru;
3. University of Texas Health Science Center at Houston, School of Public Health, Houston, Texas
4. ISGlobal, Barcelona Ctr. Int. Health Res. (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain;