Received: 17 January 2019
Accepted: 5 August 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: The study protocol and consent forms were approved by the Institutional Review Board at Hanyang University (approval number 2016–03-009). Written informed consent was obtained from all parents allowing the pediatric patients to undergo serum blood tests, respiratory virus examinations, and mycoplasma IgM tests, and for serum samples to be saved for later evaluation of biomarkers and cytokines.
: Not applicable
: The authors declare that they have no competing interests.