Test-retest Reliability for Fatigue Assessment Scale, Short Form 6 Dimension and King's Sarcoidosis Questionnaire

This study aims to see if people's health related quality of life (how they feel about their health) changes over a 12 week period if they do not receive any change in their medicines. The investigators would like people to complete four questionnaires then repeat them after three months. The investigators need to do this to in order see what difference they should expect to detect if they give people treatment that works.