["Keys of the Virgin Mary" and maternal mortality during 2 centuries].
D001942:Breast Feeding; D005260:Female; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008428:Maternal Mortality; D008880:Midwifery / Q000266:history*; D011247:Pregnancy; D011645:Puerperal Infection / Q000266:history / Q000401:mortality; D013483:Superstitions; D013548:Sweden
"Jungfru Mariae nycklar" och mödradödligheten genom två sekler.