"An exception to this rule would be the use of fetal material from indirect or spontaneous abortions, such as that recommended by Maria Michejda, M.D., in “Spontaneous Miscarriages as Source of Fetal Stem Cells” National Catholic Bioethics Quarterly, 2.3 (Autumn 2002): 401–411."
January 1, 1970
https://en.wikiquote.org/wiki/Use_of_fetal_tissue_in_vaccine_development