RT Journal Article SR Electronic T1 Central Slots & Graft Grading JF International Society of Hair Restoration Surgery FD Publication of the International Society of Hair Restoration Surgery SP 5 OP 5 DO 10.33589/3.2.0005a VO 3 IS 2 A1 Knudson, Russell YR 1993 UL http://www.ISHRS-HTForum.org/content/3/2/5.2.abstract AB