Author contribution
All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Josbert Metselaar, Amelie Boquoi, Roland Fenk, Susanne Isfort, Stefan Wilop, and Martina Crysandt. The first draft of the manuscript was written by Josbert Metselaar and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.