Now CCSVI is in international medical textbooks:
Oxford Textbook of Vascular Surgery

Section 10 - Diseases of the veins and lymphatics
10.8: Chronic cerebro-spinal venous insufficiency, Paolo Zamboni, Sergio Gianesini and Erica Menegatti

https://global.oup.com/academic/product/oxford-textbook-of-vascular-surgery-9780199658220?cc=it&lang=en&

The Oxford Textbook of Vascular Surgery draws on the expertise of over 130 specialist contributors to encompass the field of vascular surgery.