“Grand Rounds: Failure to thrive” (J Fam Pract. 2009;58:539-544) incorrectly stated that stosstherapy for rickets is “a bolus of calcitriol” (p 542). It should have read that stosstherapy is “a bolus of cholecalciferol (D3) or ergocalciferol (D2),” as the short half-life of calcitriol precludes its use for this application.