“…Furthermore, some older studies reported the diagnosis as per the International Classification of Diseases (ICD), 9th revision (ICD-9), 4 , 8 , 19 , 27 whereas recent studies used the ICD-10 criteria. 5 – 7 , 9 , 11 , 14 , 15 , 17 , 18 , 20 – 23 , 25 , 26 , 28 – 33 Occasional study reported the diagnosis as per the Diagnostic and Statistical Manual (DSM) criteria. 36 A few studies have been silent about the criteria used to make the diagnosis.…”