Photodynamic therapy with topical methyl aminolevulinate for actinic keratosis: Results of a prospective randomised multicenter trial. - Pariser,D.M.; Lowe,N.J.; Stewart,D.M.; Jarratt,M.T.; Lucky,A.W.; Pariser,R.J.; Yamauchi,P.S. (J Am Acad Dermatol, 2003)