Table 4.

Comparison with usual authorship changes

	Usual changes of authorship in pharmacology:
	First author	Co author	Last author
	Usually remains the same	Usually remains the same, additions are possible if new data are presented	Usually remains the same
	Do the changes in the authorship of the identified cases correspond to usual changes?
Paper No	First author	Co-author	Last author
1	No	No	No
2	No	No	No
3	No	No	No
4	No	No	No
5	No	No, new authors have been added, but no new data have been presented	Yes
6	Yes	Yes, but the number of co-authors added does not fit the amount of new data	No
7	No	No	Yes
8	Yes	No	No
9	No	No	Yes
10	Yes	No	No
No. of deviations	7	8	7

Usual changes in authorship of pharmacological papers are indicated by the editor-in-chief of NSAP, based on many years of experience