1. Medical Faculty; The Saarland University; Homburg Germany
2. Centre of Palliative Care and Pediatric Pain; The Saarland University Hospital; Homburg Germany
3. Institute for Medical Biometry, Epidemiology and Medical Informatics; The Saarland University; Homburg Germany
4. Department of Gynecology and Obstetrics; The Saarland University Hospital; Homburg Germany