Incorrect Units

In the JAMA Clinical Challenge entitled “Progressive Weakness and Memory Impairment in a Middle-Aged Man” published in the July 10, 2018, issue of JAMA, some units were incorrectly reported. The third and fourth sentences of the second paragraph of the Patient Outcome section should have read, “The patient was treated with intramuscular vitamin B₁₂ (1000 μg daily) for 5 days, followed by weekly injections to complete an 8-mg load. This was followed by monthly 1000-μg injections.” This article was corrected online.