SHORTENING OF PR- INTERVAL IN DIFFERENT TRIMESTERS OF PREGNANCY- A CROSS-SECTIONAL STUDY. International Journal of Biomedical and Advance Research, [S. l.], v. 2, n. 11, p. 421–426, 2011. DOI: 10.7439/ijbar.v2i11.181. Disponível em: https://www.ssjournals.co.in/index.php/ijbar/article/view/92. Acesso em: 15 may. 2026.