Correspondence to Dr H Paul Dijkstra, Department of Medical Education, Aspetar Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar; Paul.Dijkstra{at}aspetar.com Design We conducted a concept ...

A "concept" is a general, abstract idea that the human mind forms about a concrete or abstract object of thought. The term comes from the Latin cum capio: "to grasp together". It is an abstract ...