48
Participants
Start Date
October 17, 2020
Primary Completion Date
November 17, 2020
Study Completion Date
October 17, 2021
the injection of onabotulinumtoxinA at different point
For experimental group, Three units of onabotulinumtoxinA (BTX-A) per site (90 hemifaces) will be initially injected at the Yonsei point. For control group，the same dose of BTX will be injected into the levator labii superioris alaeque nasi muscle, and the injection point is located 3 to 5 mm lateral to each nostril, which was a classical injection point of this treatment.
Peking University School and Hospital of Stomatology, Beijing
Peking University
OTHER