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Diagnosis of ASD {sometimes|sometimes|sometimes|quite often|often|often} {happens|happens|happens} is difficult {because|because|due to the fact that} {there are no {clinical|medical|scientific} tests, {such as|like} a blood test for the #file_links<>C:UsersAdminDesktopfilegsa+en+100kGeorgiy2504252URLBB.txt",1,N].