Sexual initiation of youths in selected European countries compared with their sexual and contraceptive knowledge by Krauss, Hanna, Bogdański, Paweł, Szulińska, Monika, Malewski, Marek, Buraczyńska-Andrzejewska, Beata, Sosnowski, Przemysław, Piątek, Jacek, Demont, Caroline, Kaczmarek, Chris, Kaczmarek, Elizabeth, Szpakow, Andrzej, Kleszczewska, Ewa, Maciorkowska, Elżbieta, Klimberg, Aneta J, Mikrut, Kinga

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