NatCen Social Research, London School of Hygiene & Tropical Medicine, Russell, M and Senior, M (2021). National Survey of Sexual Attitudes and Lifestyles, 2010-2012: Biological Data: Secure Access. [Data Collection]. UK Data Service. http://doi.org/10.5255/UKDA-SN-8179-1

University of Glasgow, MRC/CSO Social and Public Health Sciences, University College London and London School of Hygiene and Tropical Medicine (2023). National Survey of Sexual Attitudes and Lifestyles COVID-19 Study, 2020-2021. [Data Collection]. UK Data Service. http://doi.org/10.5255/UKDA-SN-8865-2