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Sphenopalatine ganglion block followed by an epidural blood patch for postdural puncture headache management in postpartum patients: is it a confounder?

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Araújo R, Pinho S, Xavier J, et al
Sphenopalatine ganglion block followed by an epidural blood patch for postdural puncture headache management in postpartum patients: is it a confounder?