Tufts University (US), Pennsylvania State University (US), Indian Institute of Technology Kharagpur (IN), University of Freiburg (DE), Stockholm University (SE), National University of Singapore (SG), Colorado School of Mines (US), Forschungszentrum Jülich (DE), University of Alabama (US), Beijing Normal University (CN), Southern University of Science and Technology (CN), The Ohio State University (US), Colorado State University (US), Politecnico di Milano (IT), Tsinghua University (CN)