Tubal ligation can predispose to ectopic pregnancy. Essure was designed as an alternative to tubal ligation. Vasectomy is much less expensive and safer than tubal ligation. The human women have their tubal ligation reversed. Short term complications are twenty times less likely from a vasectomy than a tubal ligation. Factors that decrease risk include hormonal birth control, tubal ligation, and breast feeding. The death rate for vasectomy was 1.6 times higher than that for tubal ligation. Zainab arranges a tubal ligation for her. New Zealand, in contrast, has higher levels of vasectomy than tubal ligation. Carrie Buck was operated upon, receiving a compulsory salpingectomy (a form of tubal ligation). Montgomery had four children until 1990, when she underwent a tubal ligation. A treatment used sometimes is endoscopic band ligation. Endoscopic band ligation (EBL) is also effective at improving outcomes. Unchained sequencing by ligation is then used to determine the nucleotide sequence. This enzyme participates in benzoate degradation via coenzyme A (CoA) ligation.