[1] Univ Cologne, Doctoral Programme Gerontol Res Well Being, Albertus Magnus Pl, D-50924 Cologne, Germany
[2] Univ Cologne, Med Fac, Dept Palliat Med, Cologne, Germany
[3] Univ Educ Heidelberg, Fac Educ & Social Sci, Dept Educ Sci, Heidelberg, Germany
[4] Univ Cologne, Fac Human Sci, Ctr Hlth Serv Res Cologne, Cologne, Germany
[5] Univ Cologne, Med Fac, Cologne, Germany
[6] Univ Cologne, Med Fac, Ctr Integrated Oncol Cologne Bonn CIO, Cologne, Germany
[7] Univ Cologne, Med Fac, Clin Trials Ctr Cologne, Cologne, Germany