Bias in Epidemiological Studies
Fetal Circulation
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Updated: May 4, 2026

The 4-vessel Sampling Approach to Integrative Studies of Human Placental Physiology In Vivo
Published on: August 2, 2017
Hiralal Konar1, Asit Baran Chakraborty2
1Department of Obstetrics & Gynaecology, Calcutta National Medical College & Hospital, CD-55, Salt Lake City, Sector-1, Kolkata, 700 064 India.
Maternal mortality in India shows wide regional variations, with hypertension and hemorrhage as leading causes. A prospective study is needed to determine the exact maternal mortality ratio (MMR).
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