Hypercapnia in hospitalized children and adolescents with anorexia nervosa as a predictive marker for readmission: a prospective study.

"Declarations Ethics approval and consent to participateThis study was conducted in accordance with the Declaration of Helsinki and its later amendments or comparable ethical standards. The study protocol was approved by both the hospital research ethics committee and the hospital administrator in September 2018 (registration number R-0046/18). Informed consentWritten informed consent was obtained from the parents and, if applicable, from the participants themselves. Competing interestsThe authors have no competing to declare. Competing interests The authors have no competing to declare."

"Funding Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. Funding for open access publication provided thanks to the CRUE-CSIC agreement with Springer Nature. Funding for English language editing services was provided by the Foundation for Biomedical Research of the Niño Jesús University Children’s Hospital. No other funding was provided."

"A prospective study was performed from November 2018 to October 2019 in the Eating Disorder Ward of “Hospital Infantil Universitario Niño Jesús”, a publicly funded children's hospital in Madrid, Spain. The study protocol was approved by both the hospital research ethics committee and hospital administrator in September 2018 (registration number R-0046/18). Data were anonymized to prevent patient identification. The study was conducted in accordance with the Declaration of Helsinki. Declarations: Ethics approval and consent to participateThis study was conducted in accordance with the Declaration of Helsinki and its later amendments or comparable ethical standards. The study protocol was approved by both the hospital research ethics committee and the hospital administrator in September 2018 (registration number R-0046/18).: Informed consentWritten informed consent was obtained from the parents and, if applicable, from the participants themselves.: Competing interestsThe authors have no competing to declare. Ethics approval and consent to participate: This study was conducted in accordance with the Declaration of Helsinki and its later amendments or comparable ethical standards. The study protocol was approved by both the hospital research ethics committee and the hospital administrator in September 2018 (registration number R-0046/18)."