Johnson AM, Copas AJ, Erens B, Mandalia S, Fenton KA, Korovessis C, Wellings K, Field J. Effect of computer-assisted self interviews on reporting of sexual HIV risk behaviours in a general population sample: a methodological experiment. AIDS, 2001; 15(1):111-115

Copas, AJ, Wellings, K, Erens, B, Mercer, CH, McManus, S, Fenton, KA, Korovessis, C, Macdowall, W, Nanchahal, K, Purdon, S, Johnson, AM The accuracy of reported sensitive sexual behaviour in Britain: Exploring the extent of change 1990-2000. Sexually Transmitted Infections, 2002: 78; 26-30.

Copas AJ, Farewell V, Mercer CH, Yao G The sensitivity of estimates of the change in population behaviour to realistic changes in bias in repeated surveys. Royal Statistical Society Series A, 2004: 167 (4); 579-595.

Copas AJ, Mercer CH, Farewell VT, Nanchahal K, Johnson AM. Recent heterosexual partnerships and patterns of condom use: a weighted analysis. Epidemiology, 2009; 20: 44-51.