Berndt, Torsten
Richters, Stefanie
Jokinen, Tuija
Hyttinen, Noora
Kurtén, Theo
Otkjær, Rasmus V.
Kjaergaard, Henrik G.
Stratmann, Frank
Herrmann, Hartmut
Sipilä, Mikko
Kulmala, Markku
Ehn, Mikael http://orcid.org/0000-0002-0215-4893
Article History
Received: 18 May 2016
Accepted: 25 October 2016
First Online: 2 December 2016
Competing interests
: The authors declare no competing financial interests.