Observational Study on the Incorporation of Opioids and Their Metabolites Into Hair of Pediatric Patients

Inclusion Criteria

• •Obtained written informed-consent from legal representatives (and oral consent from the patient).
• •Patient's age must be within date of birth irrespective of gestational age to completed 13th year of life
• •Patients that received single or multiple treatment (either with single doses or continuous infusion) of fentanyl, remifentanil or sufentanil either during surgery or during stay in the pediatric intensive care unit