A Randomized, Open, Parallel, Controlled, Multi-center, Interventional, Cross-sectional Study to Evaluate the Detection Rate of Psoriatic Arthritis in Korean Moderate-to-severe Psoriasis Patients, With or Without Active Screening for Arthritis in Psoriasis (ASAP Study)

Primary objective To compare the detection rate of PsA with EARP screening versus detection rate of PsA without EARP screening in routine clinical practice in dermatological clinics amongst moderate to severe Korean Psoriasis (PsO) patients Endpoint: • Detection rate of PsA Secondary Objective To compare the sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) between EARP questionnaire (EARP group) and the investigator\'s judgement (Routine practice group) To describe the patient characteristics and disease severity between PsA and non-PsA patients Endpoint: * Sensitivity, specificity, PPV and NPV * Description of demographic characteristics, medications and PsO related characteristics