1. Multiple Pregnancy
2. Births: final data for 2016;Martin JA;Natl Vital Stat Rep,2018
3. Triplet births: trends and outcomes, 1971–94;Martin JA;Vital Health Stat,1997
4. Declines in triplet and higher‐order multiple births in the United States, 1998‐2014;Martin JA;NCHS Data Brief,2016
5. Committee Opinion No. 719: Multifetal Pregnancy Reduction