* Support: 

Questions regarding any of these reference managers can be send to refman@umcg.nl

* Access:

To use Refworks, Mendeley or EndNote at the UMCG network you need to get rights on the network. Contact your department's systems administrator or contact us at refman@umcg.nl

To use it from home:  Refworks is online only and Mendeley is free to download (www.mendeley.com). To use EndNote from home please contact us!

* EndNote & duplicates

EndNote has the most deduplication options and we therefore recommend EndNote if you are doing a systematic review.

* Refworks & duplicates

You may search your RefWorks library for duplicate documents. If references are similar, RefWorks will suggest it as a match and you can delete any unwanted records. 

** Mendeley & duplicates (advise: better not use Mendeley for a systematic review)

Mendeley reviews references’ titles, authors, file hashes, etc, when a file is imported to Mendeley, and these are checked against your existing library in Mendeley, even records that have been deleted in the past. The program will merge duplicate references into one record. You can't assess if these are true duplicates, because you can't see which records have been merged. There is no way to prevent this from occurring at the present time. Mendeley also appears to find more duplicates than other programs, like RefWorks or EndNote, so it's likely you'll lose studies due to false positives. 
Mendeley is therefore NOT recommended for a systematic review, because for a review you should to be able to justify every step. The numbers are too big to easily detect mistakes, and it's extra important to have as little mistakes as possible with this type of research.