BRAF and Hashimoto thyroiditis: We extracted the following data from the included studies: (1) study characteristics: first author, publication year, country of study, study design, study population (PTC or PTMC), number of patients, and surgical extent; (2) clinicopathologic factors for contralateral occult carcinoma: sex, age, tumor size, ipsilateral multifocality, ETE, capsular invasion, BRAF mutation, Hashimoto thyroiditis (HT), presence of contralateral benign nodule, central lymph node metastasis (CLNM), and lateral lymph node metastasis (LLNM).