TENS alone or combined with low-level laser therapy photobiomodulation for pain, functional capacity, and cardiorespiratory physiological variables after cesarean section: protocol for a randomized clinical trial - Alane Macatrão Pires de Holanda Araújo Sena; Ivan Daniel Bezerra Nogueira; Kássio Rafael Rocha de Sena; Patrícia Angélica de Miranda Silva Nogueira (PLoS ONE, 2025)