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6. Ambulatory electrocardiographic findings in young athletes between 14 and 16 years of age. Viitasalo MT, Kala R, Eisalo A. Eur Heart J; 1984 Jan; 5(1):2-6. PubMed ID: 6705801 [Abstract] [Full Text] [Related]
7. Electrocardiographic and echocardiographic characteristics of long distance runners. Comparison of left ventricular function with age- and sex-matched controls. Mumford M, Prakash R. Am J Sports Med; 1981 Jan; 9(1):23-8. PubMed ID: 7468892 [Abstract] [Full Text] [Related]