Reflections on the Canadian study by Traboulsee et al. Prevalence of extracranial venous narrowing on catheter venography in people with multiple sclerosis, their siblings, and unrelated healthy controls: a blinded, case-control study

Preface by P. Zamboni The Editorial How to objectively assess primary venous obstruction published in the last 2014 issue of Veins and Lymphatics (http://dx.doi.org/10.4081/vl.2014.4195) stimulates an intense scientific debate even involving the social networks. Strictly correlated to such an open scientific discussion we herein receive a Letter condensing thoughts again about the Traboulsee et al .’s paper published on the Lancet .