Increased doses of vaginal progesterone for the prevention of preterm birth in twin pregnancies: A randomised controlled double-blind multicentre trial

1. Serra, V.
2. Perales, A.
3. Meseguer, J.
4. Parrilla, J.J.
5. Lara, C.
6. Bellver, J.
7. Grifol, R.
8. Alcover, I.
9. Sala, M.
10. Martínez-Escoriza, J.C.
11. Pellicer, A.