S1	DE “Hips” OR hip fracture* OR femoral neck fracture* OR hip OR hips
S2	DE “Delirium” OR DE “Organic Brain Syndromes” OR organic brain syndrome* OR organic mental disorder* OR DE “mental confusion” OR DE “cognitive impairment” OR cognitive impairment* OR cognitive defect* OR cognitive disorder* OR cognitive deficit* OR “cognitive dysfunction” OR organic brain disease* OR disorientation OR organic brain disorder* OR confus* OR delir* OR DE “psychosis” OR psychosis
S3	Orthopedics OR orthopedic OR operative procedure* OR DE “surgery” OR surgery OR surgeries OR surgi*
S4	S1 AND S2 AND S3