Ketamine for Refractory Headache: A Retrospective Analysis.

Schwenk ES, Dayan AC, Rangavajjula A, Torjman MC, Hernandez MG, Lauritsen CG, Silberstein SD, Young W, Viscusi ER. Ketamine for Refractory Headache: A Retrospective Analysis. Reg Anesth Pain Med. 2018 Jun 19.

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