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Background
Hyaluronic acid (HA) fillers are known to be effective for the correction of facial wrinkles and folds, but there is no clinical study that compares the efficacy of small‐to‐medium‐particle HA fillers and large‐particle HA fillers for the correction of nasolabial folds (NLFs). Moreover, injection depth also plays an important role in the correction of NLFs as well as improvement of facial...
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