The importance of dual 5alpha-reductase inhibition in the treatment of male pattern hair loss: results of a randomized placebo-controlled study of dutasteride versus finasteride.
Olsen EA, Hordinsky M, Whiting D, Stough D, Hobbs S, Ellis ML, Wilson T, Rittmaster RS; Dutasteride Alopecia Research Team.
J Am Acad Dermatol. 2006 Dec;55(6):1014-23. doi: 10.1016/j.jaad.2006.05.007.