Impact factor is calculated by “dividing the number of citations in the Journal Citation Reports year (the numerator) by the total number of citable items published in the two previous years (the denominator).”1
Contributor Notes
Address correspondence to Dr Takuro Sanuki, Department of Dental Anesthesiology, Kanagawa Dental University, 1-23 Ogawa-cho, Yokosuka, Kanagawa, 2388570, Japan; sanuki@kdu.ac.jp.