Classification and grading of chronic venous disease in the lower limbs: A consensus statement. Nicolaides AN, chairman, Eklof B., Bergan JJ, Kistner RL, Moneta GL, exec comm, et al: Phlebology10:42-45, 1995.
2.
Widmer LK: Classification of venous disorders. Peripheral Venous Disorders. Basle III. Bern: Hans Huber, 1978.
3.
Reporting standards in venous disease. Prepared by the Subcommittee on Reporting Standards in Venous Disease, Ad Hoc Committee on Reporting Standards, Society for Vascular Surgery/North American Chapter, International Society for Cardiovascular Surgery. J Vasc Surg8:172-181, 1988.
4.
Sytchev GG: Classification of chronic venous disorders of lower extremities and pelvis . Int Angiology4:203-206, 1985.