RT Journal Article SR Electronic T1 Gravity position to prevent facial edema in hair transplantation JF International Society of Hair Restoration Surgery FD Publication of the International Society of Hair Restoration Surgery SP 77 OP 82 DO 10.33589/19.3.0077 VO 19 IS 3 A1 Sungjoo Tommy Hwang YR 2009 UL http://www.ISHRS-HTForum.org/content/19/3/77.abstract