1 Department of Anesthesiology, Intensive Care Medicine, Emergency Care and Pain Clinic, Ziekenhuis Oost-Limburg, Genk, Belgium Department of Abdominal Surgery, Ziekenhuis Oost-Limburg, Genk, Belgium Department of Anesthesiology, Intensive Care Medicine, Emergency Care and Pain Clinic, Ziekenhuis Oost-Limburg, Genk, Belgium, Faculty of Medicine and Life Sciences, Hasselt University, Diepenbeek, Belgium, [email protected].