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43. Time trends in the natural dizygotic twinning rate. Derom C, Gielen M, Peeters H, Frijns JP, Zeegers MP. Hum Reprod; 2011 Aug; 26(8):2247-52. PubMed ID: 21669967 [Abstract] [Full Text] [Related]
44. [Use of contraceptives and fertility in Panama]. Warren CW, Oberle MW, Medica W, Morris L. Perspect Int Planif Fam; 1987 Aug; (Spec No):6-11. PubMed ID: 12269055 [Abstract] [Full Text] [Related]
45. Birth and death in cities in the developing world. Popul Briefs; 1995 Jun; 1(2):6. PubMed ID: 12319545 [Abstract] [Full Text] [Related]
46. A hypothesis on the declining dizygotic twinning rates in developed countries. James WH. Prog Clin Biol Res; 1978 Jun; 24 Pt B():81-8. PubMed ID: 724710 [Abstract] [Full Text] [Related]
47. Twin seasonality in a rural Catalonian population. Hernández M, García-Moro C, Toja DI, Esparza M, González-José R. Coll Antropol; 2004 Dec; 28(2):577-83. PubMed ID: 15666588 [Abstract] [Full Text] [Related]
51. [Fertility in Brazil (urban and rural)--application of the own children method to the 1970 census]. Rodriguez Wong LL. Inf Demogr; 1983 Jun; (9):53-97. PubMed ID: 12267494 [Abstract] [Full Text] [Related]
52. [Perinatal variables and health inequalities in a health-care district in Cáceres, Spain]. Rebollo AG, Montero CM. Gac Sanit; 2000 Jun; 14(1):31-8. PubMed ID: 10757860 [Abstract] [Full Text] [Related]
53. Twinning rates and seasonal changes in Görlitz, Germany, from 1611 to 1860. Richter J, Miura T, Nakamura I, Nonaka K. Acta Genet Med Gemellol (Roma); 1984 Jun; 33(1):121-4. PubMed ID: 6540024 [Abstract] [Full Text] [Related]
58. Changes in the twinning rate in Canada 1926-70. Elwood JM. Br J Prev Soc Med; 1973 Nov; 27(4):236-41. PubMed ID: 4760507 [No Abstract] [Full Text] [Related]
59. An investigation of the high twinning rate in the Republic of Ireland. Dean G, Keane T. Br J Prev Soc Med; 1972 Aug; 26(3):186-92. PubMed ID: 5079913 [No Abstract] [Full Text] [Related]