1 TIB Leibniz Information Centre for Science and Technology, Welfengarten 1B, 30167, Hanover, Germany. lars.m.vogt@googlemail.com.
2 Department of Computer Science, Vrije Universiteit, Amsterdam, Netherlands.
3 Computational Bioscience Research Center, Computer, Electrical and Mathematical Sciences & Engineering Division, King Abdullah University of Science and Technology, 4700 KAUST, Thuwal, 23955, Saudi Arabia.