[1] Univ Texas MD Anderson Canc Ctr, Dept Palliat Care & Rehabil Med, Houston, TX 77030 USA
[2] Univ Texas MD Anderson Canc Ctr, Dept Biostat, Houston, TX 77030 USA
[3] Kosin Univ, Coll Med, Dept Internal Med, Pusan, South Korea
[4] Hallym Univ, Kangdong Sacred Heart Hosp, Dept Internal Med, Chunchon, South Korea
[5] Univ Navarra Clin, Dept Palliat Med, Pamplona, Spain