[1] Univ Med Ctr Groningen, Dept Cardiol, NL-9713 AV Groningen, Netherlands
[2] Univ Med Ctr Groningen, European Res Inst Biol Ageing, NL-9713 AV Groningen, Netherlands
[3] Univ Brescia, Dept Cardiol, Brescia, Italy
[4] Mil Hosp Wroclaw, Wroclaw, Poland
[5] Univ London Imperial Coll Sci Technol & Med, Natl Heart & Lung Inst, Royal Brompton & Harefield Hosp, London, England
[6] Brigham & Womens Hosp, Boston, MA 02115 USA
[7] Merck Res Labs, Rahway, NJ USA