Purpose The Patient Reported Outcomes Measurement Information System (PROMIS®) is a US National Institutes of Health initiative that has produced self-report outcome measures, using a framework of ...

Background: Conceptualisation and classification of functional disorders appear highly inconsistent in the health-care system, particularly in primary care. Numerous terms and overlapping diagnostic ...

The International Classification of Diseases, or ICD, is a classification system for all physical and mental diseases produced by the World Health Organization (WHO). It’s used for diagnosis, research ...

This article recalls the earliest attempts to compile international educational statistics going back into the 19th century and retraces the steps that led up to the formulation and adoption of the ...

Numerous terms have been used for symptoms and disorders without a medical diagnosis, e.g. medically unexplained symptoms (MUS), functional symptoms, functional somatic syndromes, central sensitivity ...