Normative serum cortisol levels in second and third trimesters and their associated factors: A prospective cohort study from Sri Lanka - Ishani Menike; Shashanka Rajapakse; Gayani Amarasinghe; Janith Warnasekara; Nuwan Darshana Wickramasinghe; Thilini Agampodi; Suneth Buddhika Agampodi (PLoS ONE, 2025)