[1] Jikei Univ, Div Cardiol, Sch Med, Tokyo, Japan
[2] Univ Marburg, Dept Internal Med Cardiol, Marburg, Germany
[3] Jikei Univ, Sch Med, Div Nephrol & Hypertens, Tokyo, Japan
[4] Univ Innsbruck, Inst Med Biol & Human Genet, A-6020 Innsbruck, Austria
[5] Univ Marburg, Childrens Hosp, Marburg, Germany
[6] Univ Innsbruck, Dept Clin Nephrol, A-6020 Innsbruck, Austria