A randomized study of the efficacy and safety of injectable poly-L-lactic acid versus human-based collagen implant in the treatment of nasolabial fold wrinkles

Rhoda S. Narins, Leslie Baumann, Fredric S. Brandt, Steven Fagien, Scott Glazer, Nicholas J. Lowe, Gary D. Monheit, Marta I. Rendon, Rod J. Rohrich, Wm Philip Werschler