Cao XY, Jiang XM, Dou ZH, et al: Timing of vulnerability of the brain to iodine deiciency in endemic cretinism. N Engl J Med 331: 1739, 1994
CARE Study Group: Maternal cafeine intake during pregnancy and risk of fetal growth restriction: a large prospective observational study. BMJ 337:a2332,e2008
Carter EB, Temming A, Akin J, et al: Group prenatal care compared with traditional prenatal care: a systematic review and meta-analysis. Obstet GynecoIe128(3):551,e2016
Casey BM, hon A, Peaceman M, et al: Treatment of subclinical hypothyroidism or hypothyroxinemia in pregnancy. N Engl J Med 376(9):815, 20e17
Catalano PM: Increasing maternal obesity and weight gain during pregnancy: the obstetric problems of plentitude. Obstet Gynecol 110:743,e2007 Centers for Disease Control and Prevention: Entry into prenatal care-United States, 1989-1997. MMWR 49:393,e2000
Centers for Disease Control and Prevention: Spina biida and anencephly before and ater folic acid mandate-United States, 1995-1996 and 19992000. MMWR 53(17):362, 2004
Centers for Disease Control and Prevention: Guidelines for the identiication and management of lead exposure in pregnant and lactating women. November 2010a. Available at: http://www.cdc.gov/nceh/lead/publications/ leadandpregnancy2010.pd. Accessed September 19, 2016
Centers for Disease Control and Prevention: Prevention of perinatal group B streptococcal disease: revised guidelines from CDC, 2010. MMWR 59(10): 1, 2010b Centers for Disease Control and Prevention: General recommendations on immunization-recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR 60(2):1,e2011
Centers for Disease Control and Prevention: PMS and smoking. 2013a. Available at: http://www.cdc.gov/prams/TobaccoandPrams.htm. Accessed September 18,e2016
Centers for Disease Control and Prevention: Updated recommendations for use of tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis vaccine (Tdap) in pregnant women-Advisory Committee on Immunization Practices (ACIP), 2012. MMWR 62(7):131, 2013b
Centers for Disease Control and Prevention: Guidelines for vaccinating pregnant women. 2016. Available at: http://www.cdc.gov/vaccines/pubs/ downloads/b_pre-guide. pdf. Accessed September 18, 2016
Chamberlain G, Broughton-Pipkin F (eds): Clinical Physiology in Obstetrics, 3rd ed. Oxford, Blackwell Science, 1998
Chen PH, Rovi S, Washington J, et al: Randomized comparison of 3 methods to screen for domestic violence in family practice. Ann Fam Med 5(5):430, 2007
Child Trends: Databank: late or no prenatal care. 2015. Available at: http://www. childtrends.org/?indicators=late-or-no-prenatal-care. Accessed September 19, 20e16