Figure S1. Flow diagram for study selection.

Figure S2. Odds ratio (OR) of hypersecretion remission rate, evaluating the difference between endoscopic and microscopic group in favor of endoscopy, without this difference being statistical significant (P > 0.05).

Figure S3. Risk ratio (RR) of post-operative CSF, evaluating the lack of statistical difference between endoscopic and microscopic group (P > 0.05).

Figure S4. Weighted Mean Difference (WMD) of rate of length of post-operative hospital stay, revealing the significant difference between the two groups in favor of endoscopic group (P < 0.05).

Table S1. Excluded studies.

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