About the Authors

Jong-Yi Wang

Affiliation Department of Health Services Administration, China Medical University, Taichung, Taiwan

Yi-Shan Li

Contributed equally to this work with: Yi-Shan Li, Jen-De Chen

Affiliation Department of Business, Chungyo Department Store, Taichung, Taiwan

Jen-De Chen

Contributed equally to this work with: Yi-Shan Li, Jen-De Chen

Affiliation Office of the President, National Changhua University of Education, Changhua, Taiwan

Wen-Miin Liang

Affiliation Graduate Institute of Biostatistics, China Medical University, Taichung, Taiwan

Tung-Chuan Yang

Affiliation Reproductive Medicine Center, Department of Obstetrics and Gynecology, China Medical University Hospital, Taichung, Taiwan

Young-Chang Lee

Affiliation Reproductive Medicine Center, Yuan's General Hospital, Kaohsiung, Taiwan

Chia-Woei Wang

cwwang@ms4.hinet.net

Affiliation Department of Obstetrics and Gynecology, Taipei Medical University Hospital, Taipei, Taiwan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JYW. Performed the experiments: YSL TCY YCL CWW. Analyzed the data: YSL. Contributed reagents/materials/analysis tools: JDC WML. Wrote the paper: JYW JDC CWW.