1. Births final data 2002;Martin,2003
2. Annual summary of vital statistics: 2006;Martin;Pediatrics,2008
3. Trends in the occurrence, determinants, and consequences of multiple births;Blondel;Semin Perinatol,2002
4. Genetics and genetic counseling;Drugan,1996
5. Prenatal diagnosis in twin gestations: A comparison between second-trimester amniocentesis and first-trimester chorionic villus sampling;Wapner;Obstet Gynecol,1993