[1] Univ Hosp Tuebingen, Tubingen, Germany
[2] Univ Calif San Diego, La Jolla, CA 92093 USA
[3] UCL, Sch Med, London, England
[4] Univ Amsterdam, Acad Med Ctr, Amsterdam, Netherlands
[5] Univ Hosp, Basel, Switzerland
[6] Novartis Pharma AG, Basel, Switzerland
[7] Univ N Carolina, Chapel Hill, NC USA