In-line skates and skateboards.
D000293:Adolescent; D000328:Adult; D002487:Centers for Disease Control and Prevention, U.S.; D002648:Child; D002669:Child Welfare; D006260:Head Protective Devices; D006801:Humans; D007255:Information Services; D011481:Protective Clothing; D017751:Safety Management / Q000379:methods*; D012861:Skating / Q000293:injuries*; D014481:United States / Q000453:epidemiology; D014947:Wounds and Injuries / Q000453:epidemiology / Q000209:etiology* / Q000517:prevention & control*