Hello Paul
I apologize that this was not responded to previously but we do have an updated file that should help to import these types of authors.
You will need to put the file you can download from the following website:
in the following location on your machine. You will want to close Reference Manager before you do this.
C:\Program Files\Reference Manager 12
or
C:\Program Files (x86)\Reference Manager 12
You should then be able to do the same search of PubMed for 4113603 (UID) and it should not import the author as De,Broe M but as De Broe M.
Let us know if you have any questions or if this does not resolve the issue.