1. Department of Medicine, Division of Dermatology, Yong Loo Ling School of Medicine, National University Hospital National University of Singapore Singapore
2. Department of Otolaryngology & Head and Neck Surgery, Campus Klinikum Bielefeld Mitte University Hospital OWL of Bielefeld University Bielefeld Germany
3. Department of Haematology, Oncology and Palliative Medicine, Campus Klinikum Bielefeld Mitte University Hospital OWL of Bielefeld University Bielefeld Germany