Defining the relationship between obstetricians and maternal-fetal medicine specialists.
D005260:Female; D006801:Humans; D007400:Interprofessional Relations; D016015:Logistic Models; D008297:Male; D009774:Obstetrics / Q000379:methods / Q000706:statistics & numerical data*; D010500:Perinatology / Q000379:methods / Q000706:statistics & numerical data*; D011247:Pregnancy; D018566:Pregnancy, High-Risk; D012017:Referral and Consultation / Q000706:statistics & numerical data* / Q000639:trends; D011795:Surveys and Questionnaires; D014481:United States