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5. Congregation for the Doctrine of the Faith 1987: Instruction on Respect for Human Life in its Origin and on the Dignity of Procreation Replies to Certain Questions of the Day Donum Vitae, http://www.vatican.va/roman_curia/congregations/cfaith/documents/rc_con_cfaith_doc_19870222_respect-for-human-life_en.html. Accessed March 19, 2018.