1. Oral and Maxillofacial Microvascular Reconstruction LAB, Brong Ahafo Regional Hospital, Sunyani, Ghana.
2. Department of Ear, Nose and Throat, Brong Ahafo Regional Hospital, Sunyani, Ghana.
3. Department of Oral and Maxillofacial Surgery, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.