Fetal head size and effect of manual perineal protection.Published in:PLoS ONE, 2017, v. 12, n. 12, p. 1, doi. 10.1371/journal.pone.0189842By:Jansova, Magdalena;Kalis, Vladimir;Rusavy, Zdenek;Räisänen, Sari;Lobovsky, Libor;Laine, KatariinaPublication type:Article