1. Department of Nephrology Sheikh Khalifa Specialty Hospital Ras al Khaimah United Arab Emirates
2. Department of Internal Medicine Seoul National University College of Medicine Seoul Korea
3. Department of Internal Medicine Yonsei University College of Medicine Seoul Korea
4. AIDS Research Institute Yonsei University College of Medicine Seoul Seodaemun‐gu Korea
5. Biostatistics Collaboration Unit, Department of Biomedical Systems Informatics Yonsei University College of Medicine Seoul Korea