[1] Univ London, Sch Pharm, Ctr Pharmacognosy & Phytotherapy, London WC1N 1AX, England
[2] Univ London London Sch Hyg & Trop Med, Dept Infect & Trop Med, London WC1E 7HT, England
[3] Univ Panama, Fac Farm, CIFLORPAN, Panama City, Panama
[4] Sultan Qaboos Univ, Dept Pharmacognosy, Muscat, Oman