Yu-Tung Hung is a biostatistician at the Management Office for Health Data (DryLab), Clinical Trial Research Center (CTC), China Medical University Hospital. Website: http://www.cmuhctc.tw/. E-mail: billyhu.cmuh@gmail.com and yutunghung1227@gmail.com Office: (04) 2205-2121 ext 4570 or 4571 Fax: 04-22358329