Assessing the associations of daily respiratory symptoms and lung function in schoolchildren using an Air Quality Index for ozone: Results from the RESPOZE panel study in Athens, Greece - Stergiopoulou, A; Katavoutas, G.; Samoli, E.; Dimakopoulou, K.; Papageorgiou, I.; Karagianni, P.; Flocas, H.; Katsouyanni, K. (Science of the Total Environment, 2018)