[1] St Lukes Int Univ, Grad Sch Nursing Sci, Chuo Ku, 10-1 Akashi Cho, Tokyo 1040044, Japan
[2] St Lukes Int Hosp, 10-1 Akashi Cho, Tokyo 1040044, Japan
[3] Hirano Kameido Himawari Clin, Koto Ku, 7-10-1 Kameido, Tokyo 1360071, Japan
[4] Tohoku Univ, Grad Sch Med, Dept Palliat Nursing Hlth Sci, Aoba Ku, 2-1 Seiryomachi, Sendai, Miyagi 9808575, Japan