%0 Journal Article %T Predictive value of traction force measurement in vacuum extraction: Development of a multivariate prognostic model %A Gunilla Ajne %A Jonas Ranstam %A Khurram Yousaf %A Kristina Pettersson %A Magnus Westgren %J Archive of "PLoS ONE". %D 2017 %R 10.1371/journal.pone.0171938 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5336195/