1. What we do Available athttp www rcog org uk what we do;RCOG
2. Choice of instruments for assisted vaginal delivery CD;Mahony;review Database Syst Rev,2010
3. de do Carmo MS de score associated with mode of delivery in Sao Paulo de;Kilsztajn;AM,2007
4. GRIT concern about external validity;Gardosi;Lancet,2005
5. DM Forceps delivery in modern obstetric practice;Patel;Med,2004