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. 2020 Jul 17;25(11):1881–1891. doi: 10.1007/s10147-020-01747-1

Fig. 1.

Fig. 1

Preferred reporting items for systematic reviews and meta-analyses flow chart for article selection process to analyze the prognostic impact of serum testosterone levels in castration-resistant prostate cancer. The studies in which HR was extracted from the multivariable analysis were included for qualitative meta-analysis