Kristiina Manderbacka, , Elina Hemminki, Ossi Rahkonen, Juha Teperi, Marital Status as a Predictor of Perinatal Outcome in Finland, Journal of Marriage and Family, Vol. 54, No. 3 (Aug., 1992), pp. 508-515
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Manderbacka et al. (1992) studied this question.