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Publisher
- ovid technologies (wolters kluwer health)11
- oxford university press / usa10
- lippincott williams & wilkins9
- bmj publishing group7
- elsevier b.v.7
- elsevier bv7
- journal of neurosurgery publishing group (jnspg)5
- lippincott williams & wilkins, inc5
- american association of neurosurgeons dba journal of neurosurgery publishing group4