@inbook{1175620396, author={Robert A. Weiss and Margaret A. Weiss and Karen L. Beasley}, title={Physiologic and Other Tests for Venous Evaluation}, booktitle={Sclerotherapy and Vein Treatment, 2e}, publisher={McGraw Hill LLC}, address={New York, NY}, year={2012}, url={dermatology.mhmedical.com/content.aspx?aid=1175620396} }