@inbook{1135432501, author={John Murtagh AM, MBBS, MD, BSc, BEd, FRACGP, DipObstRCOG}, title={}, booktitle={Murtagh’s Practice Tips, 7e}, publisher={McGraw-Hill Education}, address={Sydney, Australia}, year={2016}, url={murtagh.mhmedical.com/content.aspx?aid=1135432501} }