1 Department of Medicine, National University Hospital, National University Health System, Singapore, Singapore.
2 Department of Pathology, National University Health System, Singapore, Singapore.
3 Division of Plastic, Reconstructive and Aesthetic Surgery, Department of Surgery, National University Hospital, National University Health System, Singapore, Singapore.
4 Division of Plastic, Reconstructive and Aesthetic Surgery, Department of Surgery, Ng Teng Fong General Hospital, National University Health System, Singapore, Singapore.