1. DTU Chemistry, Technical University of Denmark, Kemitorvet Bldg. 207, DK-2800 Kongens Lyngby, Denmark
2. Department of Molecular and Translational Medicine, Università degli Studi di Brescia, Viale Europa 11, I-25123 Brescia, Italy
3. Arbeitsgruppe Quantenchemie, Ruhr-Universität Bochum, Bochum D-44780, Germany