Physiotherapy methods to facilitate pelvic floor muscle contraction: a systematic review - Vasconcelos, Elaine Cristine Lemes Mateus; Ribeiro, Aline Moreira; Antônio, Flávia Ignácio; Brito, Luiz Gustavo de Oliveira; Ferreira, Cristine Homsi Jorge (Physiotherapy Theory and Practice, 2018)