%C England %O This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. %L discovery10139273 %K Diagnostic Tests, Routine, Humans, Sarcosine, Schizophrenia %J British Journal of Psychiatry %P 653-653 %D 2020 %A D Curtis %V 217 %T Author's reply. %N 5