Oktavian, Rizki, Department of Obstetrics and Gynecology, Faculty of Medicine, Universitas Andalas/Dr. M. Djamil Central General Hospital, Padang (Indonesia)
Oktaviono, Yudi Her, Department of Cardiology and Vascular Medicine, Faculty of Medicine, Dr. Soetomo General Hospital/University of Airlangga, Surabaya (Indonesia)
Oktoberia, Intan Sari, National Institute of Health Research and Development, Ministry of Health of Indonesia, Jakarta (Indonesia)
Olatunde, Farombi Ebenezer, Drug Metabolism and Toxicology Research Laboratories, Department of Biochemistry, College of Medicine, University of Ibadan (Nigeria)