Innovators. Fast balls could be fatal.
Sandrick
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KM
D016507:Cardiology Service, Hospital; D002648:Child; D002675:Child, Preschool; D004867:Equipment Design; D006801:Humans; D010414:Pennsylvania; D011482:Protective Devices; D013177:Sports; D013898:Thoracic Injuries / Q000150:complications / Q000453:epidemiology* / Q000517:prevention & control; D014481:United States / Q000453:epidemiology