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Matser, Amy; Heiligenberg, Marlies; Geskus, Ronald; Heijman, Titia; Low, Nicola; Kretzschmar, Mirjam; Schim van der Loeff, Maarten (2014). The importance of partnership factors and individual factors associated with absent or inconsistent condom use in heterosexuals: a cross-sectional study. Sexually transmitted infections, 90(4), pp. 325-331. BMJ Publishing Group 10.1136/sextrans-2013-051087
