T M Proebstle1, J Alm2, S Dimitri3, L Rasmussen4, M Whiteley5, J Lawson6, A Davies7. 1. University of Mainz, Mainz, Germany. 2. Dermatoligikum, Hamburg, Germany. 3. The Countess of Chester Hospital, Chester, United Kingdom. 4. Danish Vein Centers, Naestved, Denmark. 5. The Whiteley Clinic, Guildford, United Kingdom. 6. Skin and Vein Clinic Oosterwal, Alkmaar, The Netherlands. 7. Imperial College, London, United Kingdom.