1 1 Department of Anesthesiology and Pain Management, Maastricht University Medical Centre (MUMC+), University Pain Centre Maastricht (UPCM) , Maastricht, The Netherlands .
2 2 Centre of Expertise for Palliative Care, Maastricht University Medical Centre (MUMC+) , Maastricht, The Netherlands .
3 3 Department of Clinical Epidemiology and Medical Technology Assessment, Maastricht University Medical Centre , Maastricht, The Netherlands .
4 4 Department of translational neuroscience, School of Mental Health and Neuroscience, Maastricht University , Maastricht, The Netherlands .