1. Ashley K Vavra, Division of Vascular Surgery, Northwestern Feinberg School of Medicine, Chicago, IL, USA, Tel.: +1 312 503 6701, Fax: +1 312 503 1222,
2. Melina R Kibbe, Northwestern University, 676 North St Clair, Suite 650, Chicago, IL 60611, USA
3. Jesse Brown Veterans Affairs Medical Center, Chicago, IL, USA, Tel.: +1 312 503 6701, Fax: +1 312 503 1222,