Cardiovascular pre-participation evaluation of male competitive athletes: results of a clinical and electrocardiographic screening program in southwestern Greece oleh Eleni-Evangelia Koufou, Athanasios Moulias, Grigorios Tsigkas, Virginia-Aikaterini Mplani, Periklis Davlouros, Aris Koulouris, Panagiotis Antonakopoulos, Maria Christopoulou