MCLAREN, MJ. Non-ejection systolic clicks and mitral systolic murmurs in Black school-children of Soweto, Johannesburg. Br Heart J. 1976, 38, 718-724
CHANDRARATNA, PAN. Incidence of mitral valve prolapse in one hundred clinically stable newborn baby girls : An echocardiographic study. Am Heart J. 1979, 98, 312-314