New Jersey's air ambulances grounded by hospitals.
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D000401:Aircraft; D000552:Ambulances; D006801:Humans; D007350:Insurance, Hospitalization / Q000191:economics*; D007373:Interinstitutional Relations; D009515:New Jersey; D014193:Trauma Centers / Q000706:statistics & numerical data*; D014947:Wounds and Injuries / Q000191:economics*