Moers-Carpi M, Tufet J. (2007) Calcium Hydroxylapatite versus Nonanimal Stabilized
Hyaluronic Acid for the Correction of Nasolabial Folds: A 12-Month, Multicenter, Prospective, Randomized, Controlled, Split-Face Trial, Dermatologic Surgery, 2008; 34:210-215.