The chlamydia screening studies: rationale and design
N Low, A McCarthy, J Macleod, C Salisbury, P J Horner, T E Roberts, R Campbell, A Herring, S Skidmore, E Sanford, J A C Sterne, G Davey Smith, A Graham, M Huengsberg, J Ross, M Egger
Sexually Transmitted Infections Oct 2004, 80 (5) 342-348; DOI: 10.1136/sti.2003.006197