@book { ObesityinEurope, title = "Obesity in Europe", subtitle = "Young peopleā€˜s physical activity and sedentary lifestyles", author = "Wolf-Dietrich {Brettschneider} and Roland {Naul}", year = "2007", publisher = "Peter Lang Verlag", address = "Berlin, Germany", url = "https://www.peterlang.com/document/1103376" }