1. Department of Internal Medicine, Amsterdam UMC, The Netherlands (G.K.H.).
2. Geffen School of Medicine, University of California, Los Angeles (N.E.L.).
3. Cardiovascular, The Medicines Company, Parsippany, NJ (D.K., R.M.S., P.L.J.W.).
4. Department of Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa (F.J.R.).