[1] George Washington Univ, Sch Med & Hlth Sci, Sci Biol, 2300 1 St NW, Washington, DC 20052 USA
[2] Childrens Natl Med Ctr, Div Otolaryngol, 111 Michigan Ave NW, Washington, DC 20010 USA
[3] Penn State Hershey Dermatol, Dept Dermatol, 500 Univ Dr,UPC 1,Suite 100, Hershey, PA USA