Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (GRK1874 Diabetic Microvascular Complications)
Received: 28 February 2018
Accepted: 21 June 2018
First Online: 10 August 2018
Duality of interest
: All authors declare that there is no duality of interest associated with this manuscript. TK is a full-time employee of Boehringer Ingelheim. Boehringer Ingelheim had no influence on the conception and design of this study, or on the decision to publish the results.