1. Institute of Pharmaceutical Biology and Phytochemistry, University of Münster, Corrensstraße 48, D-48149 Münster, Germany
2. Department of Pharmaceutical and Medicinal Chemistry, University of Nigeria Nsukka, 410001 Nsukka, Nigeria
3. Swiss Tropical and Public Health Institute (Swiss TPH), Socinstraße 57, CH-4002 Basel, Switzerland