Howe, Laura D, Galobardes, Bruna, Matijasevich, Alicia, Gordon, David, Johnston, Deborah, Onwujekwe, Obinna, Patel, Rita, Webb, Elizbeth A, Lawlor, Debbie A, Hargreaves, James R, "Measuring socio-economic position for epidemiological studies in low- and Middle-income countries: a methods of measurement in epidemiology paper", International Journal of Epidemiology, 2012