RT Journal Article SR Electronic T1 Maximizing Donor Hair Yield by Understanding the Geometry of Donor Hair Exit Angles and the Application of Trigonometric Functions to the Donor Area JF International Society of Hair Restoration Surgery FD Publication of the International Society of Hair Restoration Surgery SP 173 OP 175 DO 10.33589/10.6.0173 VO 10 IS 6 A1 Cole, John P. YR 2000 UL http://www.ISHRS-HTForum.org/content/10/6/173.abstract AB