Letter against flawed statement published on Chronic Cerebrospinal Venous Insufficiency state of the art:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4603685/

I read with interest the article published by Kugler et al. [1]. Regarding the duplex ultrasound examination the author didn’t consider the paper by Zamboni et al. [2] published in December 2011 on international angiology.