Correction

Following publication of the original article [1], the authors reported a correction in the units in the methods section under “Subjects”

Originally, the sentence was stated as:

(ii) exhibited no evidence of prostate cancer as determined by blood test (PSA < 4 mg/dL)

The correct sentence is:

(ii) exhibited no evidence of prostate cancer as determined by blood test (PSA < 4 ng/ml)