Serum neutrophil gelatinase-associated lipocalin (NGAL) as a diagnostic tool in pediatric acute appendicitis: a prospective validation study.

"Declarations Competing interestsThe authors declare no competing interests. Conflict of interestThe authors declare that they have no conflict of interest. Ethics board committeeThe ethics committee for clinical research of the Complejo Hospitalario de Navarra (CHN, Pamplona, Spain) assessed this project under registration code PI_2020/112 and approved it on December 18, 2020. Informed consentPrior to inclusion in this study, all the legal guardians of the patients involved in the study gave their verbal and written consent by means of an informed consent form. Competing interests The authors declare no competing interests. Conflict of interest The authors declare that they have no conflict of interest."

"Funding Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature."

"Declarations: Competing interestsThe authors declare no competing interests.: Conflict of interestThe authors declare that they have no conflict of interest.: Ethics board committeeThe ethics committee for clinical research of the Complejo Hospitalario de Navarra (CHN, Pamplona, Spain) assessed this project under registration code PI_2020/112 and approved it on December 18, 2020.: Informed consentPrior to inclusion in this study, all the legal guardians of the patients involved in the study gave their verbal and written consent by means of an informed consent form. Ethics board committee: The ethics committee for clinical research of the Complejo Hospitalario de Navarra (CHN, Pamplona, Spain) assessed this project under registration code PI_2020/112 and approved it on December 18, 2020."