[1] Ewha Womans University,Department of Preventive Medicine, College of Medicine
[2] Ewha Womans University,Graduate Program in System Health Science and Engineering
[3] Chung-Ang University,Department of Preventive Medicine, College of Medicine
[4] Mokdong Hospital,Clinical Trial Center
[5] Ewha Womans University,Department of Pediatrics, College of Medicine
[6] Ewha Womans University,undefined