Limitations: This study's analysis is limited to specific metadata (affiliation, gender). Further research is needed to determine bias in other sensitive attributes (race, nationality, etc.). Due to limitations in the experimental design and dataset, generalizations regarding the degree and impact of bias should be made with caution. Furthermore, there is a lack of consideration for potential bias not only in the LLM itself but also in the design and operation of the peer review system that utilizes the LLM.