Analysis of health behaviours of pregnant women in the perinatal period during the SARS-CoV-2 virus pandemic based on the Health Behaviour Inventory - Filipiak, Katarzyna; Kot, Justyna; Ostrogórska-Gonszewska, Patrycja; Leja-Szpak, Anna; Matuszyk, Dorota (Nursing Problems / Problemy Pielęgniarstwa, 2023)