Seasonality and Objective Physical Activity and Sedentary Behaviour among Older Adults from Four European Countries oleh João Martins, Houshmand Masoumi, Vânia Loureiro, Margarida Gomes, Fortunata Ratinho, Tiago Ribeiro, Melika Mehriar, Marija Rakovac, Davor Šentija, Andrzej Bahr, Marta Tomczyk, Wojciech Dynowski, Roberto Solinas, Maria Grazia Pirina, Donatella Coradduzza, Giannangelo Boccuzzi, Birol Çağan, Ahmet Dalcı, Athanasios Papageorgiou, Soultana Smaga, Georgios Parisopoulos, Georgios Patsakas, Ioannis Meimaridis, Nuno Loureiro, Adilson Marques