Accepted and E-pub version articles are published online before they appear in a regular issue of the journal. Accepted articles are PDF versions of manuscripts that have been peer reviewed and accepted for publication, but not yet copyedited or typeset, allowing readers the most rapid access to accepted papers. The accepted article remains on this page until the final proof version of the paper is posted in Epub Ahead-of Print page.
Accepted article is given its own Doi, so it can be citable as it has been linked to PubMed.

It may be cited as shown in the following example:
Park IH, Im SA, Jung KH, Sohn JH, Park YH, Lee KS, et al. Randomized Open Label Phase III Trial of Irinotecan Plus Capecitabine versus Capecitabine Monotherapy in Patients with Metastatic Breast Cancer Previously Treated with Anthracycline and Taxane: PROCEED Trial (KCSG BR 11-01). Cancer Res Treat. 2018 Feb 14 [Epub]. https://doi.org/10.4143/crt.2017.562.