You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Introduction . Tenofovir ( TDF ) is an inhibitor of reverse transcriptase nucleotide analogue , although it has good tolerability and high anti - retroviral activity , its effect on the kidney has been a concern . Objective . To describe a girl infected with HIV who presented Fanconi syndrome during antiretroviral therapy with TDF . Clinical case . We describe a HIV - 1 - infected girl , who after 18 months treatment with TDF presented loss of strength and pain of the lower extremities with functional impairment . Laboratory findings were consistent with Fanconi syndrome . Radiographs showed bilateral hip fracture and wrists . Full recovery of Fanconi syndrome was achieved four months after changing antiretroviral therapy . Conclusions . TDF - prescribing physicians must be prepared to detect signs and symptoms of renal dysfunction and immediately consider switching to another antiviral drug . 
functional impairment