Actually I just found this article which suggests there may still be some controversy over it although it is from 2013:
http://care.diabetesjournals.org/content/36/Supplement_2/S287
Here is one from Nature Reviews but it is behind a paywall and the abstract doesn't really say much:
http://www.nature.com/nrendo/journal/v9/n10/full/nrendo.2013.159.html