Barriers to healthcare access and continuity of care among Ukrainian war refugees in Europe: findings from the RefuHealthAccess study - Kardas, Przemyslaw; Mogilevkina, Iryna; Aksoy, Nilay; Ágh, Tamas; Garuoliene, Kristina; Lomnytska, Marta; Istomina, Natalja; Urbanaviče, Rita; Wettermark, Björn; Khanyk, Nataliia (Frontiers in Public Health, 2025)