[1] Univ Hosp Erlangen, Div Hematol & Oncol, Dept Internal Med, Erlangen, Germany
[2] Paracelsus Med Univ, Div Pneumol, Dept Internal Med, Nurnberg, Germany
[3] Paracelsus Med Univ, Dept Psychosomat Med, Nurnberg, Germany
[4] Univ Tubingen, Dept Nursing Sci, Tubingen, Germany
[5] Univ Hosp, Inst Gen Practice & Interprofess Care, Tubingen, Germany
[6] Fac Med Tuebingen, Tubingen, Germany
[7] Univ Hosp Heidelberg, Inst Gen Practice & Hlth Serv Res, Heidelberg, Germany