1 University of Lucerne, Lucerne, Switzerland. Electronic address: cdfankhauser@gmail.com.
2 Abteilung Onkologie und Hämatologie, Kantonsspital Graubünden, Chur, Switzerland.
3 Institute of Oncology of Southern Switzerland, EOC, Bellinzona, Switzerland; Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland.
4 Departement Innere Medizin, Klinik für Medizinische Onkologie und Hämatologie, Kantonsspital St. Gallen, St. Gallen, Switzerland.