1.	Exploring concurrent sexual partnerships: new definitions and estimates from a study of youth in urban Kenya  •  Hongwei Xu, Brown University; Nancy Luke, Brown University; Eliya M. Zulu, African Population and Health Research Center (APHRC)

2.

Sexual behaviour patterns in South Africa and their effect on the spread of HIV: insights from a mathematical model  •  Leigh Johnson, University of Cape Town; Debbie Bradshaw, Medical Research Council of South Africa; Victoria Pillay-Van Wyk, Social Aspects of HIV/AIDS and Health, Human Sciences Research Council; Thomas Rehle, Social Aspects of HIV/AIDS and Health, Human Sciences Research Council

3.	Concurrency and HIV spread in sub-Saharan countries: biases from self-reported data and their implications for HIV prevention  •  Stephane Helleringer, Columbia University; Linda Kalilani-Phiri, University of Malawi; Jemima A. Frimpong, University of Pennsylvania

4.

HIV/STI risk perceptions and protective actions among adults with concurrent sexual partnerships: a study of Mexican sexual biographies  •  Cecilia Gayet, Facultad Latinoamericana de Ciencias Sociales (FLACSO); Nancy Pedraza, El Colegio de México; Marta Caballero, Instituto Nacional de Salud Pública (INSP); Carlos Magis Rodríguez, Centro Nacional para la Prevención y el Control del VIH/SIDA; Michel Bozon, Institut National d'Études Démographiques (INED)

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