1 Department of General Surgery, Nottingham City Hospital, Nottingham, United Kingdom.
2 Department of Otorhinolaryngology and Head & Neck Surgery, Radboudumc, Nijmegen, the Netherlands.
3 Department of Plastic, Reconstructive and Aesthetic Surgery, Florence Nightingale Hospital Düsseldorf, Düsseldorf, Germany.
4 Department of Intensive Care Medicine, Elisabeth-Tweesteden Hospital Tilburg, Tilburg, the Netherlands; Department of General, Abdominal Surgery and Coloproktology, Helios St. Elisabeth Klinik, Oberhausen, Germany; Faculty of Health, Witten/Herdecke University, Witten, Germany. Electronic address: sjaakpwls@gmail.com.