Views of policy makers and Health promotion professionals on factors facilitating implementation and maintenance of interventions and policies promoting physical activity and healthy eating: results of the DEDIPAC project Muellmann, Saskia, Steenbock, Berit, De Cocker, Katrien, De Craemer, Marieke, Hayes, Catherine, O’Shea, Miriam, Horodyska, Karolina, Bell, Justyna, Luszczynska, Aleksandra, Roos, Gun, Langøien, Lars Jørun, Rugseth, Gro, Terragni, Laura, De Bourdeaudhuij, Ilse, Brug, Johannes, Pischke, Claudia (2017)