What are the factors that contribute to the development of sexual dysfunction in breastfeeding women? A systematic scoping review protocol - Fuentealba-Torres, Miguel; Cartagena-Ramos, Denisse; Sierra, Juan Carlos; Lara, Lúcia Alves; Okano, Sérgio Pires; Berra, Thaís Zamboni; Alves, Luana Seles; Leite, Ana Carolina Andrade Biaggi; Yamamura, Mellina; Silva, Isilia Aparecida; Nascimento, Lucila Castanheira; Arcêncio, Ricardo Alexandre (BMJ Open, 2018)