Effects of highly concentrated hyaluronic acid filler on nasolabial fold correction: A 24-month extension study. - Noh, Tai Kyung; Moon, Hye Rim; Yu, Ji Su; Chang, Sung Eun; Moon, Ik Jun; Choi, Sun Young; Oh, Won Jong; Won, Chong Hyun; Kim, Beom Joon; Lee, Yang Won (Journal of Dermatological Treatment, 2016)