[1] Dept Med Cardiol Angiol & Internal Intens Care, Homburg, Germany
[2] Hannover Med Sch, Dept Cardiol & Angiol, Hannover, Germany
[3] Groote Schuur Hosp, Hatter Inst Cardiovasc Res Afr, Med Sch, Dept Med, Anzio Rd, Cape Town, South Africa
[4] Univ Cape Town, ZA-7925 Cape Town, South Africa