Adalimumab was prescribed in the usual manner in accordance with the terms of the local marketing authorization with regards to dose, population and indication. The assignment of a participant to an adalimumab-containing regimen was decided in advance and was to be current practice. The prescribing of adalimumab was clearly separated from the decision to include the participant in the study. Participants were observed for a maximum of 12 months, with a total of 5 study visits (Screening = Visit 1).