1. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince of Songkla University, Hatyai, Songkhla 90112, Thailand
2. Department of Pathology, Faculty of Medicine, Prince of Songkla University, Hatyai, Songkhla 90112, Thailand
3. National Metal and Materials Technology Center, Thailand Science Park, Pathumthani 12120, Thailand