Oguzhan Zhengi, the sole author of the journal entitled “The Transition from Gel Separatory Serum Tubes to Lithium Heparin Gel Tubes in the Clinical Laboratory”, stated that a specific criteria was adhered to when handling the specimens. Throughout the Methodology, Zhengi explained the Clinical and Laboratory Standards Institute (CLSI) Criteria - GP34-A:2010. What was the content of this specific criteria and how did he utilize this document?