1. Pain Management Center; Neurocenter of Southern Switzerland; Ospedale Regionale di Lugano; Lugano Switzerland
2. Medical Physics Unit; Ospedale Regionale di Bellinzona e Valli; Bellinzona Switzerland
3. Clinical Epidemiology and Medical Technology Assessment; Maastricht University Medical Centre; Maastricht The Netherlands
4. Department of Anesthesiology; VU University Medical Center; EMGO+ Institute for Health and Care Research; Amsterdam The Netherlands