[1] Univ Brescia, Cattedra Cardiol, Brescia, Italy
[2] Acad Cardiol Unit, Kingston Upon Hull, Yorks, England
[3] Hop La Pitie Salpetriere, Dept Cardiol, Paris, France
[4] Sahlgrens Univ Hosp, Dept Med, S-41345 Gothenburg, Sweden
[5] Osped Cattinara, Dept Cardiol, Trieste, Italy
[6] Nottingham Clin Res Ltd, Nottingham, England
[7] F Hoffmann LaRoche, Dept PBU, Basel, Switzerland
[8] Natl Heart & Lung Inst, London, England