Public Perceptions of the Socioeconomic Importance of Urban Green Areas in the Era of COVID-19: A Case Study of a Nationwide Survey in Greece oleh Antonios Kolimenakis, Alexandra D. Solomou, Nikolaos Proutsos, Evangelia V. Avramidou, Evangelia Korakaki, Georgios Karetsos, Aimilia B. Kontogianni, Konstantinos Kontos, Christos Georgiadis, Georgios Maroulis, Eleftherios Papagiannis, Konstantinos Lagouvardos, Konstantinia Tsagkari