Source: http://www.cngof.net/Journees-CNGOF/MAJ-GO/2014/Mises%20%C3%A0%20jour%20en%20gyn%C3%A9cologie%20m%C3%A9dicale%202014/Partie%201_Gyn%C3%A9cologie%20m%C3%A9dicale/Contraception%20intra-ut%C3%A9rine_nullipare_le%20pour.pdf