Adult 1 Cushing Syndrome 1 Cushing syndrome 1 Health Surveys 1 Humans 1 Models, Psychological 1 Models, Statistical 1 Psychometrics 1 Quality of Life 1 Reproducibility of Results 1 Survey-development 1 adult 1 graded response model health survey 1 human 1 item response theory 1 procedures 1 psychological model 1 psychology 1 psychometry 1 quality of life 1 quality of life, Cushing’s syndrome 1 reproducibility 1 standards 1 statistical model 1