Prevention of unintended pregnancies by using emergency contraception: the differences between levonorgestrel and ulipristal acetate. A theoretical model using data from a survey on the use of emergency contraception in Spain, 2017

1. Lete, I.
2. Doval, J.L.
3. Pérez-Campos, E.
4. Alonso, M.J.
5. Sellers, G.
6. Sánchez-Borrego, R.