Effects and Challenges Regarding Supervision in Palliative Care Teams: Results of a 5-Year Study in South Tyrol (Italy) by Klaus Garber, Salvatore Giacomuzzi, Katrin Gapp, Maria Luise Obexer, Anna Goegele-Blasbichler, Adolf Engl, Ivan Titov, Markus Ertl, Martin Rabe, Kira Sedykh, Oleksandr Kocharian, Natalia Barinova