P Prandoni, S Villalta, P Bagatella, L Rossi, A Marchiori, A Piccioli, E Bernardi, B Girolami, P Simioni and A Girolami (1997) “The clinical course of deep-vein thrombosis. Prospective long-term follow-up of 528 symptomatic patients”, Haematologica. Pavia, Italy, 82(4), pp. 423-428. doi: 10.3324/%x.