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Junior Researcher at the Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa  (Portugal).
 
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Full Professor at the Department of Astronomy, Beijing Normal University, Beijing (China).
 
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Postdoctoral Fellow at The University of Pennsylvania, Center for Particle Cosmology,
Department of Physics and Astronomy, Philadelphia  (USA).
 
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Assistant Professor at the Instituut Lorentz for Theoretical Physics, Leiden (The Netherlands).
 
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                Former PhD student at the Instituut Lorentz for Theoretical Physics, Leiden   
        
        
        (The Netherlands). 
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         Postdoc at Johns Hopkins University, Baltimore (USA).
         
        
        
        
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                Researcher at INAF, Osservatorio Astronomico di Roma, Roma  
        
         (Italy). 
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               Postdoc at the Instituut Lorentz for Theoretical Physics, Leiden   
        
        (The Netherlands). 
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