Department of Internal Medicine, Division of Cardiology, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan (Republic of China)
* Wei-Chieh Lee and Chih-Yuan Fang contributed equally to the writing of this article.
Correspondence to Chih-Yuan Fang, MD, 123 Ta Pei Road, Niao Sung District, Kaohsiung City 83301, Taiwan (Republic of China) Tel: +886 7 731 7123 x8300; fax: +886 7 732 2402; e-mail: firstname.lastname@example.org
Received May 11, 2016
Received in revised form May 23, 2016
Accepted June 8, 2016