International Journal of Epidemiology 2009 38(5):1422; doi:10.1093/ije/dyp302
Published by Oxford University Press on behalf of the International Epidemiological Association © The Author 2009; all rights reserved.
Improving epidemiological surveys of sexual behaviour conducted by telephone
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doi:10.1093/ije/dyp210
Int J Epidemiol 2009;38:1118–1127
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