1Gosain AK.Amarante MTJ,Hyde JS,et al.A dynamic Analysis of changes in the nasolabial fold using magnetic Kesonance imaging:Implications for facial re juvenation and facial animationsurgery.Rlast Reconstr Surg,1996,98:622 ~ 636.
2David M,Sarver M,Ackerman.B.Dynamic smile visualization and quantification:part 1.Evolution of the concept and dynamic records for smile capture.Am J Orthod Dentofac Ort hop,2003,124:4~ 12.