Biostax Corp (BTAX)

[locicat1]

I can provide the answer to what I believe you are referring to when you noted on the bottom of the Pubmed abstract page:

DOI: 10:1016/intimp.2018.05.020

DOI is the Digital Object Indentifier and 10.1016 is not a date. Most all articles will have a 10. followed by a sequence number in this case 1016--that is not a date. What is a date follows after intimp. which is 5/20/18 which is the indication that the article was electronically published ahead of the actual journal print date. If you look at the first line of the abstract page and note the journal name and volume and date and pages in the journal you will note the intimp.of 2018.05.020 and in brackets the notation Epub ahead of print.

Since you probably do not have a copy of the actual journal publication it indicates that the paper was originally received on March 21, 2018 by the journal for consideration to be published. Hence, a timely submission.