1. National Center for Medical Information and Knowledge, Korea National Institute of Health, Cheongju, Korea.
2. Seoul National University Biomedical Informatics (SNUBI), Seoul National University College of Medicine, Seoul, Korea.
3. Department of Biomedical Informatics, Asan Medical Center, Seoul, Korea.
4. Systems Biomedical Informatics National Core Research Center (SBI-NCRC), Seoul National University College of Medicine, Seoul, Korea.