Safety, Longevity and Patient Satisfaction Comparison of Four Hyaluronic Acid Soft Tissue Fillers in Lip Augmentation: Study Protocol for a Randomized Controlled Clinical Trial

There is need for evidence-based and reproducible data comparing the safety, longevity and patient satisfaction propensity of the various HA soft tissue filler products. Among cosmetic HA soft tissue filler procedures, especially the lip augmentation has become common. Therefore, the aim of this study is to determine whether a statistically significant difference can be detected in the safety, longevity and/or patient satisfaction related to four HA soft tissue filler products widely used for cosmetic lip augmentation. Specifically, the aim of this study is to determine whether superiority of one or more product(s) over the others can be detected.