in guideline Behavioural Abnormality Pica http://purl.obolibrary.org/obo/HP_0011856 HP:0011856 An appetite for and the persistent ingestion of non-food substances such as clay. In order to diagnose pica, this behavior must have persisted over a period of at least one month. Sufficient SCDO:0000904 Quality of Life Related SCD Symptoms and Complications A Parental Guide to Managing Sickle Cell Disease Sickle Cell Disease in Children, Standards and Guidelines for Clinic Care