1. 1Chulabhorn International College of Medicine, Thammasat University, Pathumthani 12121, Thailand
2. 2Department of Anatomy, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
3. 3School of Medicine, Walailak University, Nakhon Si Thammarat 80161, Thailand
4. 4Department of Anatomy, Faculty of Science, Mahidol University, Bangkok 10400, Thailand