[1] Univ Hosp Leuven, Dept Gen Med Oncol, Leuven, Belgium
[2] Katholieke Univ Leuven, Dept Publ Hlth & Primary Care, Hlth Serv & Nursing Res, Leuven, Belgium
[3] Vrije Univ Brussel, Univ Ziekenhuis Brussel, Dept Med Oncol, Oncol Ctr, Brussels, Belgium
[4] Vrije Univ Brussel, Frailty Ageing FRIA Res Grp, Brussels, Belgium
[5] UCL, Clin Univ St Luc, Dept Med Oncol, Brussels, Belgium
[6] UCL, Clin Univ St Luc, Dept Geriatr Med, Brussels, Belgium
[7] Univ Libre Bruxelles, Dept Med Oncol, Erasme Univ Hosp, Brussels, Belgium
[8] ULB, Inst Jules Bordet, Clin Psychooncol, Brussels, Belgium
[9] ZNA Stuivenberg, Dept Med Oncol, Antwerp, Belgium
[10] Ctr Hosp Univ Sart Tilman, Dept Med Oncol, Liege, Belgium
[11] Iridium Canc Network Antwerp, Dept Med Oncol, Antwerp, Belgium
[12] Iridium Canc Network Antwerp, Dept Med Oncol, AZ Klina, Brasschaat, Belgium
[13] ZNA Middelheim, Dept Med Oncol, Antwerp, Belgium
[14] Univ Antwerp Hosp, Dept Med Oncol, Antwerp, Belgium
[15] AZ Turnhout, Ctr Oncol & Hematol, Turnhout, Belgium
[16] AZ Vesalius, Dept Med Oncol, Tongeren, Belgium
[17] Gen Hosp Groeninge, Ctr Canc, Kortrijk, Belgium
[18] Univ Greenwich, Ageing & Canc Res Cluster, Ctr Posit Ageing, London SE18 6PF, England
[19] AZ Sint Lucas, Dept Geriatr Med, Ghent, Belgium
[20] Imelda Hosp, Dept Med Oncol, Bonheiden, Belgium
[21] Free Univ Brussels, Dept Geriatr Med, CHU St Pierre, Brussels, Belgium
[22] CHC Liege Hosp Grp, Dept Oncol, Clin St Joseph, B-4000 Liege, Belgium
[23] GHDC Grand Hop Charleroi, Dept Med Oncol, Charleroi, Belgium
[24] Ctr Hosp Mouscron, Dept Med Oncol, Mouscron, Belgium
[25] Clin & Matern St Elisabeth, Dept Med Oncol, Namur, Belgium
[26] Ctr Hosp Jolimont, Dept Med Oncol, La Louviere, Belgium
[27] Univ Hosp Leuven, Dept Geriatr Med, Leuven, Belgium
[28] Katholieke Univ Leuven, Dept Clin & Expt Med, Leuven, Belgium
[29] Katholieke Univ Leuven, Dept Oncol, Leuven, Belgium