The NFL has vowed to learn from the concussion controversy surrounding Tua Tagovailoa after the quarterback suffered a sickening head injury just days on from another worrying collision that left him stumbling down the field.One prominent campaigner called for job losses and even jail time for Dolphins staff after Tagovailoa was hospitalized following the incident in Thursday's defeat by the .The quarterback was hurled to the turf in the first half and remained down for more than seven minutes.
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