Quality of life : differences related to gender, age, socio-economic status and health status, in Portuguese teens - Gaspar, Tânia, 1977-; Matos, Margarida Gaspar de, 1956-; Ribeiro, José Luís Pais, 1910-; Leal, Isabel Maria Pereira; Costa, Paula; Erhart, Michael; Ravens-Sieberer, Ulrike (2010)