The patients making up the sample were attended at the Oxygen Therapy Outpatient Center of the São Paulo Hospital, coordinated by the Department of Pneumology of the Federal University of São Paulo UNIFESP.
Los pacientes que compusieron la muestra eran atendidos en el Ambulatorio de Oxigenoterapia del Hospital Sao Paulo, coordenado por la Disciplina de Neumología de la Universidad Federal de Sao Paulo UNIFESP.
Os pacientes que compuseram a amostra eram atendidos no Ambulatório de Oxigenoterapia do Hospital São Paulo, coordenado pela Disciplina Pneumologia da Universidade Federal de São Paulo Unifesp.