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Line graphs illustrating the day of hyponatremia onset (the first documented serum sodium <135 mEq/L) and nadir in each of the three severity groups (A: mild; B: moderate; C: severe hyponatremia) in 62 patients with post-operative hyponatremia in a group of 344 consecutive patients who underwent transsphenoidal resection of a pituitary mass at the authors’ institution between January, 2006, and December, 2012.
