Patients who will provide their consent to participate will undertake an interview about the risk factors in early childhood and their habits regarding alcohol consumption and use of tobacco. Compliance to testing and treatment, treatment results, adverse effects and reasons for dropping out will be additionally monitored. Gathered data will be analysed in alignment with our research questions. The investigators will disseminate reports and present the results to both the general public and the scientific community in order to foster future developments in gastric cancer prevention. conditions: Gastric Cancer conditions: H Pylori Infection conditions: H Pylori Eradication conditions: H-pylori studyType: OBSERVATIONAL observationalModel: COHORT timePerspective: PROSPECTIVE count: 6800 type: ESTIMATED name: Bismuth-based quadruple therapy name: Levofloxacin-based quadruple therapy name: Standard triple therapy name: Levofloxacin-based triple measure: Healthcare workers' assessment of feasibility and acceptability of the proposed practical implementation of a screening program measure: Eradication rate of infection with H. pylori measure: Description of the adverse events profile measure: Participation rate of subjects selected for the program sex: ALL minimumAge: 30 Years maximumAge: 34 Years stdAges: ADULT facility: University Hospital Centre Zagreb status: RECRUITING city: Zagreb state: Grad Zagreb zip: 10000 country: Croatia name: Masa Cavlina Sevo, MD role: CONTACT phone: 00385995900847 email: masa.cavlina@gmail.com name: Mirjana Kalauz, Asst. Prof. role: CONTACT phone: 0038598519088 email: mirjanakalauz1@gmail.com name: Mirjana Kalauz, Asst. Prof. role: PRINCIPAL_INVESTIGATOR name: Pave Markos, MD, PhD role: SUB_INVESTIGATOR name: Tihomir Bradic, MD role: SUB_INVESTIGATOR name: Masa Cavlina Sevo, MD role: SUB_INVESTIGATOR lat: 45.81444 lon: 15.97798 facility: Clinical Hospital Center Rijeka status: RECRUITING city: Rijeka zip: 51000 country: Croatia name: Sandra Milic, MD role: CONTACT phone: 0038551658122 email: smilic05@gmail.com lat: 45.32674 lon: 14.44239 facility: Beacon Hospital status: RECRUITING city: Dublin zip: D18 AK68 country: Ireland name: Charlene Deane, MB Bch BAO, MSc role: CONTACT phone: 00353879114305 email: charlene.deane@beaconhospital.ie name: Ruth Pilkington, MB BcH BAO role: CONTACT phone: 0035312937521 email: ruth.pilkington@beaconhospital.ie name: Colm O Morain, MD, MB BcH BAO, FRCPI role: PRINCIPAL_INVESTIGATOR name: Orlaith Kelly, PHD, MB BcH role: SUB_INVESTIGATOR name: Charlene Deane, MB Bch BAO, MSc, MRCP role: SUB_INVESTIGATOR lat: 53.33306 lon: -6.24889 facility: Clinical and Preventive Medicine of the University of Latvia status: NOT_YET_RECRUITING city: Riga zip: LV1079 country: Latvia name: Marcis Leja, MD, PhD role: CONTACT phone: 371+29497500 email: marcis.leja@lu.lv name: Marcis Leja, MD, PhD role: PRINCIPAL_INVESTIGATOR name: Danute Razuka Ebela, MD, PhD role: SUB_INVESTIGATOR name: Linda Mezmale, MD role: SUB_INVESTIGATOR lat: 56.946 lon: 24.10589 facility: Wroclaw Medical University status: RECRUITING city: Wroclaw zip: 50-367 country: Poland name: Katarzyna Malinowska role: CONTACT phone: 00487178417 99 email: k.malinowska@umw.edu.pl name: Elzbieta Olejnik role: CONTACT phone: 00717841666 email: elzbieta.olejnik@umw.edu.pl name: Katarzyna Neubauer, MD, PhD, Assoc. Prof. role: PRINCIPAL_INVESTIGATOR name: Radoslaw Kempinski, MD, PhD role: SUB_INVESTIGATOR lat: 51.1 lon: 17.03333 facility: Iuliu Hatieganu University of Medicine and Pharmacy status: RECRUITING city: Cluj-Napoca state: Cluj County zip: 400003 country: Romania name: Dan Lucian Dumitrascu, Prof role: CONTACT phone: 0040722756475 email: ddumitrascu@umfcluj.ro name: Radu Farcas, MD, PhD student role: CONTACT phone: 0040757554422 email: radufr@gmail.com name: Radu Farcas, MD, PhD student role: SUB_INVESTIGATOR lat: 46.76667 lon: 23.6 facility: National Institute of Public Health, Slovenia status: RECRUITING city: Ljubljana zip: 1000 country: Slovenia name: Mitja Oblak, MSc role: CONTACT phone: 0038612441541 email: Mitja.Oblak@nijz.si name: Tatjana Kofol, MD role: CONTACT phone: 0038612441484 email: Tatjana.Kofol@nijz.si name: Bojan Tepeš, prof., MD role: PRINCIPAL_INVESTIGATOR lat: 46.05108 lon: 14.50513 hasResults: False