1. National Genome Research Institute, National Institute of Health, Seoul 122-701, Korea.
2. Department of Genetic Epidemiology, SNP Genetics, Seoul 153-803, Korea.
3. Department of Preventive Medicine, Ajou University School of Medicine, Suwon 443-749, Korea.
4. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Ansan 425-707, Korea.
5. Department of Biomedical Engineering, School of Medicine, Kyung Hee University, Seoul 130-702, Korea.