Permanent deacons, those who do not seek priestly ordination, preach and teach. The Eucharist is an integral part of many other sacramental services, including ordination and Confirmation. Some evangelical denominations officially authorize the ordination of women in churches. The restrictions that apply are similar to a monastic ordination, such as permission from parents. Chinese nuns possess the full "bhikkuni" ordination, Tibetan nuns do not. Hegarty blames this decline on the Church's positions on female ordination, contraception and sexuality. The presbyteries are responsible for the ordination of the ministers. Only a small percentage of rabbis earn the "yadin yadin" ordination. They must marry prior to their ordination. A similar process can lead to the annulment of an ordination. Francis has addressed the subject of the ordination of women a number of times. It recommended that fellows be released from an obligation for ordination. Customs regarding other aspects of higher ordination also vary between countries. They have been increasingly open to the ordination of women. An ordinal for ordination services was added in 1550.