[1] Charite Univ Med Ctr, Berlin, Germany
[2] Univ Appl Sci, Munster, Germany
[3] Dept Med Biometry & Epidemiol, Hamburg, Germany
[4] Univ Appl Sci, Osnabruck, Germany
[5] Klin See, Rudersdorf, Germany
[6] Univ Heidelberg, Dept Cardiol, D-6900 Heidelberg, Germany