title: Mean age of first sex: do they know what we mean?
authors: Jokin
authors: J
authors: de Irala
authors: Alfonso
authors: A
authors: Osorio
authors: Silvia
authors: S
authors: Carlos
authors: Miguel
authors: M
authors: Ruiz-Canela
authors: Cristina
authors: C
authors: López-del Burgo
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