Prevalence of and factors in suicidal thoughts in 14-15-year-olds. A Polish-Ukrainian study - Ostaszewski, Krzysztof; Markiewicz, Milena; Klimanska, Maryna; Haletska, Inna; Herasym, Halyna; Klymanska, Larysa; Mirchuk, Iryna; Savka, Viktor; Zelena, Oksana (Advances in Psychiatry and Neurology/Postępy Psychiatrii i Neurologii, 2025)