TY - CHAP M1 - Book, Section TI - Ulcer A1 - Nguyen, Giang A2 - Phillips, Raymond E. PY - 2021 T2 - Venous Insufficiency AB - The most vexing complication of venous insufficiency—the ulcer—poses three levels of burden: SN - PB - McGraw Hill CY - New York, NY Y2 - 2024/03/28 UR - accesscardiology.mhmedical.com/content.aspx?aid=1175312569 ER -