{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,4,1]],"date-time":"2022-04-01T23:08:00Z","timestamp":1648854480922},"reference-count":25,"publisher":"Cambridge University Press (CUP)","issue":"3","license":[{"start":{"date-parts":[[2014,8,1]],"date-time":"2014-08-01T00:00:00Z","timestamp":1406851200000},"content-version":"unspecified","delay-in-days":8797,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Acta genet. med. gemellol.: twin res."],"published-print":{"date-parts":[[1990,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Ultrasonographic examinations were performed on 519 pregnant women in the first trimester at three hospitals in Tokyo from August 1985 to March 1987. Among 519 women, two fetal heart movements (FHMs) were comfirmed in six cases. In two of these six cases, one of two FHMs disappeared two weeks later, and these were considered the \u201cvanishing twin\u201d. In eight cases among those with ultrasonographic image of echo-free-space (EFS) in the uterus, the observed EFS was considered to be a probable empty gestational sac (GS-like-EFS-image). Seven of eight GS-like-EFS-images were observed in October-December (p &lt; 0.01) and two \u201cvanishing twin\u201d cases were also observed in the same season. Spontaneous abortion occurred in 11 cases and these were also more frequently observed in October-November (p &lt; 0.05). Some abortive factor is supposed to have prevailed in October-December. All six women having twin fetuses (including the \u201cvanishing twin\u201d cases) were born in January-May (p &lt; 0.05) and those having GS-like-EFS-images or terminating their pregnancy in spontaneous abortion were also born more frequently in the same season. Twin-prone and abortion-prone characteristics of the women born in this season are considered.<\/jats:p>","DOI":"10.1017\/s0001566000005250","type":"journal-article","created":{"date-parts":[[2016,7,27]],"date-time":"2016-07-27T06:00:58Z","timestamp":1469599258000},"page":"339-344","source":"Crossref","is-referenced-by-count":5,"title":["Seasonality in Early Loss of One Fetus Among Twin Pregnancies"],"prefix":"10.1017","volume":"39","author":[{"given":"I.","family":"Nakamura","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Uno","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Y.","family":"Io","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"I.","family":"Ikeshita","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K.","family":"Nonaka","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"T.","family":"Miura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2014,8,1]]},"reference":[{"key":"S0001566000005250_ref008","doi-asserted-by":"publisher","DOI":"10.1080\/03014467600001321"},{"key":"S0001566000005250_ref001","first-page":"89","article-title":"Seasonal changes in the frequency of fetal damages and fertility","volume":"164","author":"Czeizel","year":"1967","journal-title":"Gynaecologia"},{"key":"S0001566000005250_ref013","first-page":"350","article-title":"Is spontaneous abortion a seasonal problem?","volume":"16","author":"Kovar","year":"1960","journal-title":"Obstet Gynecol"},{"key":"S0001566000005250_ref012","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.1960.tb09255.x"},{"key":"S0001566000005250_ref011","first-page":"175","article-title":"Epidemiology of twin births from a climatic point of view","volume":"30","author":"Kamimura","year":"1976","journal-title":"Br J Prev Soc Med"},{"key":"S0001566000005250_ref024","first-page":"135","article-title":"Multiple pregnancies and photoperiodicity","volume":"57","author":"Timonen","year":"1968","journal-title":"Ann Chir Gyneacol Fenn"},{"key":"S0001566000005250_ref016","doi-asserted-by":"publisher","DOI":"10.1002\/jcu.1870040104"},{"key":"S0001566000005250_ref010","first-page":"25","article-title":"The vanishing twin","volume":"2","author":"Jeanty","year":"1981","journal-title":"Ultrasonics"},{"key":"S0001566000005250_ref004","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.1978.tb14893.x"},{"key":"S0001566000005250_ref020","doi-asserted-by":"publisher","DOI":"10.1017\/S0001566000006139"},{"key":"S0001566000005250_ref014","doi-asserted-by":"publisher","DOI":"10.1017\/S0001566000008278"},{"key":"S0001566000005250_ref007","doi-asserted-by":"publisher","DOI":"10.1007\/BF01901731"},{"key":"S0001566000005250_ref021","first-page":"51","volume-title":"Seasonal Effects on Reproduction, Infection and Psychoses. 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