1 Minerva Foundation Institute for Medical Research, Helsinki, Finland; Department of Medicine, University of Helsinki and Helsinki University Hospital, Helsinki, Finland; Department of Internal Medicine, Yale University, New Haven, Connecticut, USA. Electronic address: panu.luukkonen@fimnet.fi.
2 Department of Gastrointestinal Surgery, Abdominal Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
3 Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, Turku, Finland; School of Medical Sciences, Örebro University, Örebro, Sweden.
4 Department of Chemistry, Örebro University, Örebro, Sweden.
5 Department of Pathology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
6 Department of Clinical Sciences in Malmö, Lund University Diabetes Center, Lund University, Malmö, Sweden.
7 Minerva Foundation Institute for Medical Research, Helsinki, Finland; Department of Medicine, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.