1. Department of Vascular Surgery, St George's Hospital, London, UK
2. Department of Cardiovascular Clinical Research, Schering, Berlin, Germany
3. Department of Orthopaedics, Universiteit Ziekenhuis St Pieter, Leuven, Belgium
4. Department of Vascular Surgery, University Hospital Utrecht, The Netherlands
5. Orszagos Orvosi Rehabilitacios Intezet, Szanatorium Utca 2, Budapest, Hungary
6. Department of Vascular Surgery, Community Hospital, Kalmaz, Sweden
7. Department of Vascular Surgery, Istituto di Patologia Guviwigica; Perugia, Italy
8. Department of Biometrics, Schering, Berlin, Germany