PA: RN's 'right to comp.' fought by employer: 'reasonable grounds' for challenge existed.
D000062:Accidents, Occupational / Q000331:legislation & jurisprudence*; D019567:Back Injuries / Q000209:etiology*; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000150:complications; D017770:Lifting / Q000009:adverse effects*; D008159:Lumbar Vertebrae; D009740:Nursing Staff / Q000331:legislation & jurisprudence*; D010414:Pennsylvania; D013168:Spondylolisthesis / Q000150:complications; D013997:Time Factors; D014942:Workers' Compensation / Q000331:legislation & jurisprudence*