A randomised clinical trial of the effect of low-level laser therapy for perineal pain and healing after episiotomy: a pilot study - Santos, Jaqueline de Oliveira; Oliveira, Sonia Maria Junqueira Vasconcellos de; Nobre, Moacyr Roberto Cuce; Aranha, Ana Cecilia Corrêa; Alvarenga, Marina Barreto (Midwifery, 2012)