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Morrissey, K, Kinderman, P 
ORCID: 0000-0001-8972-8548, Pontin, E, Tai, S and Schwannauer, M
(2016)
Web based health surveys: Using a Two Step Heckman model to examine their potential for population health analysis.
Social Science and Medicine, 163 (C).
pp. 45-53.