I have noticed that, there are quite a number of error in authors' affiliation information, including a) missing affiliation information (about 45% for authors appear after year 2000, and this ratio is increasing with time) b) error affiliation information.
Case b) can be caused by several reasons, e.g originally wrongly assigned, or an author has changed his/her job to a new company or university. Would you please describe how you assign affiliation to an author? and how you update this information?
Best regards,
Tom Fu