Källén B, Rybo G
Acta Obstet Gynecol Scand. 1978;57(3):257-9. doi: 10.3109/00016347809154894.
A small "epidemic" of conjoined twinning is reported occurring at the Skövde Central hospital in 1975-76. Three parts were observed, the annual birth number of 2300. During a ten-year period, 10 cases of conjoined twinning were reported to the Register of Congenital Malformations in Sweden, indicating a probable incidence of 1:75000 births. These 10 cases were distributed all over the country. Interviews with the three women who gave birth to the Skövde conjoined twins revealed no common factor which could be of aetiological significance.
据报道，1975 - 1976年在舍夫德中心医院出现了一小波联体双胎“流行”情况。在年出生数为2300例的情况下，观察到了3例。在十年期间，瑞典先天性畸形登记处收到了10例联体双胎报告，这表明联体双胎的发病率可能为1:75000活产。这10个病例分布在全国各地。对生下舍夫德联体双胞胎的三名女性进行访谈后发现，没有发现可能具有病因学意义的共同因素。
