Risk factors associated with pelvic inflammatory disease
I Simms, J M Stephenson, H Mallinson, R W Peeling, K Thomas, R Gokhale, P A Rogers, P Hay, P Oakeshott, J Hopwood, H Birley, M Hernon
Sexually Transmitted Infections Dec 2006, 82 (6) 452-457; DOI: 10.1136/sti.2005.019539