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2. Hylan gel biomaterial;Larsen;dermal and immunologic compatibility,1993
3. Safety data of injectable nonanimal stabilized hyaluronic acid gel for soft tissue augmentation;Friedman;Dermatol Surg,2002
4. Restylane lip implantation;Bousquet;European experience,1999
5. The first clinical study using a new biodegradable implant for the treatment of lips, wrinkles, and folds;Olenius;Aesth Plast Surg,1998