A randomized clinical trial of 5 % topical minoxidil versus 2 % topical minoxidil and placebo in the treatment of androgenetic alopecia in men. - Olsen,E.A.; Dunlap,F.E.; Funicella,T.; Koperski,J.A.; Swinehart,J.M.; Tschen,E.H.; Trancik,R.J. (J Am Acad Dermatol, 2002)