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. 2021 May 11;16(5):e0251554. doi: 10.1371/journal.pone.0251554

Fig 1. Flowchart of the study population.

Fig 1

Of 4,066 patients, 312 were included in this study. The study patients were classified into two groups: those with Zn levels < 60 μg/dl (low-Zn group) and those with Zn levels ≥ 60 μg/dl (high-Zn group). Abbreviation: Zn, serum zinc.