3Unger WP.Hair transplantation:current concepts and techniques.J Invest Dermatol Symp Proc,2005,10(3):225-229.
4Rassman WR,Bernstein RM,McClellan R,et al.Follicular unit extraction:minimally invasive surgery for hair transplantation.Dermatol Surg,2002,28(8):720-728.