1 Institute of Clinical and Preventive Medicine & Faculty of Medicine, University of Latvia, Riga, Latvia

2 Riga East University Hospital, Riga, Latvia

3 Riga Stradins University, LV-1007, Riga, Latvia

4 Institute for Breath Research, Universität Innsbruck, Innsbruck and Dornbirn, Austria

5 Institute of Chemistry, Jan Kochanowski University of Kielce, Kielce, Poland

6 National Cancer Institute of Ukraine, Kyiv, Ukraine

7 Medical Genomics group and Endoscopy Center, A.C.Camargo Cancer Center, São Paulo, Brazil

8 University Hospital San Ignacio, Bogotá, Colombia

9 Department of Building Materials Technology, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, Krakow, Poland

10 Digestive Diseases Centre GASTRO, Riga, Latvia

11 Department of Chemical Engineering and Russel Berrie Nanotechnology Institute, Technion—Israel Institute of Technology, Haifa, Israel