Melvyn W.B. Zhang , MBBS, DCP, MRCPsych MBBS, DCP, MRCPsych, National HealthCare Group, SingaporeCyrus S.H. Ho , MBBS, DCP, MRCPsych, National University of Singapore Roger Ho , MBBS, DPM, DCP, Gdip Psychotherapy, MMed (Psych), MRCPsych, FRCPC, National University of SingaporeIan H. Treasaden , MBBS, LRCP, MRCS, FRCPsych, LLM, West London Mental Health NHS Trust, Southall, UK Basant K. Puri, MA, PhD, MB, BChir, BSc (Hons) MathSci, DipStat, PG Dip Maths, MMath, FRCPsych, FRSB, Hammersmith Hospital and Imperial College London, UK