RT Journal Article SR Electronic T1 Controversies: Do doctors need to re-certify? JF International Society of Hair Restoration Surgery FD Publication of the International Society of Hair Restoration Surgery SP 183 OP 183 DO 10.33589/23.5.0183 VO 23 IS 5 A1 Knudsen, Russell YR 2013 UL http://www.ISHRS-HTForum.org/content/23/5/183.abstract AB