1. Centro de Estudios en Salud, Universidad del Valle de Guatemala, 18 Av. 11-95, Zona 15, Vista Hermosa III, Ciudad de Guatemala, Guatemala.
2. Pharmacognosy and Phytotherapy Research Group, UCL School of Pharmacy, University of London, 29-39 Brunswick Square, London, WC1N 1AX, UK.
3. Indigena Biodiversity Limited, Gerrards Cross, UK.
4. Section of Epidemiology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland.
5. Thompson Forest Limited, West Kelowna, BC V4T 1T6, Canada.