TY  - JOUR 
T1  - Duration of effectiveness of Botulinum toxin type A in excessive gingival display: a systematic review and meta-analysis
JO  - Brazilian Oral Research
A1  - Chagas, Taísa Figueiredo
A1  - Almeida, Natalia Valli de
A1  - Lisboa, Cinthia Oliveira
A1  - Ferreira, Daniele Masterson Tavares Pereira
A1  - Mattos, Claudia Trindade
A1  - Mucha, José Nelson
SN  - 1806-8324
UL  - 10.1590/1807-3107bor-2018.vol32.0030
VL  - 32 
Y1  - 2018
PB  - Brasil 
ER  -