1. Independent Consultant, C/Camino a Cuevas del Monte, 10, San Lorenzo, Las Palmas 35018, Canary Islands
2. Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, 4123 Basel, Switzerland
3. University of Basel, 4056 Basel, Switzerland
4. Global Health Institute of Merck, Ares Trading S.A., a subsidiary of Merck KGaA (Darmstadt, Germany), Route de Crassier 1, 1262 Eysins, Switzerland