<qa>  How many patients will be recruited in the Netherlands over a one year period?Two-hundred patients will be recruited in the Netherlands over a one year period. In all cases, the decision to treat the patient with apremilast will be made prior to the decision to enter the subject into this study. Treatment will be according to routine clinical practice and based on recommendations as per the SPC of apremilast Otezla. Recruitment will continue until 200 patients have entered the study. Each patient will be followed for 12 months. 