[1] Mackay Mem Hosp, Dept Phys Med & Rehabil, Taipei 10449, Taiwan
[2] Natl Chiao Tung Univ, Dept Mech Engn, Hsinchu 30010, Taiwan
[3] Taipei Tzu Chi Hosp, Buddhist Tzu Chi Med Fdn, Dept Obstet & Gynecol, Taipei 23142, Taiwan
[4] Tzu Chi Univ, Sch Med, Hualien 97004, Taiwan