1. Department of Obstetrics and Gynecology, Taipei Tzu-Chi Hospital, The Buddhist Tzu-Chi Medical Foundation, Taipei, Taiwan;
2. Department of Physical Medicine and Rehabilitation, Main Branch, Mackay Memorial Hospital, Taipei, Taiwan;
3. Department of Mechanical Engineering, National Chiao-Tung University, Hsinchu City, Taiwan;
4. School of Medicine, Buddhist Tzu-Chi University, Hualien, Taiwan