Rajlakshmi Yadav, Ashok Kumar Verma, Vinita Malhotra and Rahul Chavhan 2017. Placental thickness estimation by ultrasonography and its correlation with gestational age in normal pregnancies in late 2nd and 3rd trimester. Asian Pacific Journal of Health Sciences. 4, 4 (Dec. 2017), 130–132. DOI:https://doi.org/10.21276/apjhs.2017.4.4.31.