1. Cardiorenal Research Laboratory, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota, United States
2. Department of Community and General Medicine, School of Medicine, Sapporo Medical University, Sapporo, Japan
3. Department of Medicine and Surgery, University of Parma, Parma, Italy
4. Biomedical Statistics and Informatics, Mayo Clinic, Rochester, Minnesota, United States
5. Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark