1. Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
2. Chulabhorn International College of Medicine, Thammasat University, Pathumthani 12120, Thailand
3. Chakri Naruebodindra Medical Institute, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok 10540, Thailand
4. Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Songkhla 09112, Thailand
5. Department of Physiology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
6. Department of Anatomy, Faculty of Medicine, Srinakharinwirot University, Wattana, Bangkok 10110, Thailand