1. Division of Neonatology, Department of Paediatrics, University Hospital Son Espases, Palma de Mallorca, Spain
2. Clinical Analysis Department, Hospital Universitari Son Llàtzer, Research Institute of Health Sciences (IdISBa), Palma de Mallorca, Spain
3. Department for Anti-Drug Policies (DPA), Rome, Italy
4. Clinical Toxicology Unit, Clinical Analysis Department, Hospital Universitari Son Espases, Research Institute of Health Sciences (IdISBa), Palma de Mallorca, Spain
5. Drug Testing Consultants, #801 265 Russell Hill Road, Toronto, ON, M4V2T3, Canada