European guideline for sclerotherapy of varicosis. Part 1: Indications and contraindications - Rabe, E.; Breu, F.; Cavezzi, A.; Smith, P.; Frullini, A.; Gillet, J.; Guex, J.; Hamel-Desnos, C.; Kern, P.; Partsch, B.; Ramelet, Anne-Sylvie; Tessari, L.; et al. (2014)