Hirsikko, A. [P:(DE-Juel1)157625] ; Vakkari, V. [P:(DE-HGF)0] ; Tiitta, P. [P:(DE-HGF)0] ; Hatakka, J. [P:(DE-HGF)0] ; Kerminen, V.-M. [P:(DE-HGF)0] ; Sundström, A.-M. [P:(DE-HGF)0] ; Beukes, J. P. [P:(DE-HGF)0] ; Manninen, H. E. [P:(DE-HGF)0] ; Kulmala, M. [P:(DE-HGF)0] ; Laakso, L. [P:(DE-HGF)0]