[1] Tokushima Univ, Grad Sch, Inst Biomed Sci, Dept Child Hlth & Nursing, 3-18-15 Kuramoto Cho, Tokushima 7708509, Japan
[2] Tokushima Univ, Grad Sch, Inst Biomed Sci, Dept Community Med & Human Resource Dev, Tokushima, Japan
[3] Tokushima Univ, Fac Med, Sch Hlth Sci, Tokushima, Japan