Home › Authors › John Koo 👤 John Koo 6 books Books by John Koo Clinical Cases in Phototherapy 2017 Moderate to Severe Psoriasis Moderate to Severe Psoriasis 2014 Clinical Cases In Psychocutaneous Disease 2013 Contemporary guide to dermatology 2007 Contemporary Diagnosis and Management in Primary Care Dermatology 2002 English Legal System (150 Leading Cases) 2002