AUTHOR=Adasevic Boris , Turudic Daniel , Milosevic Danko TITLE=Commentary: Serum Calprotectin Is a Valid Biomarker in Distinction of Bacterial Urinary Tract Infection From Viral Respiratory Illness in Children Under 3 Years of Age JOURNAL=Frontiers in Pediatrics VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/pediatrics/articles/10.3389/fped.2022.921939 DOI=10.3389/fped.2022.921939 ISSN=2296-2360