Fig. 1From: Transmission of SARS-CoV-2 considering shared chairs in outpatient dialysis: a real-world case-control studyDepiction of the study design for the retrospective case-control analysis. Each case-control pair at the index shift had a backward assessment to determine if the patient who received dialysis in the previous shift was found to be a COVID-19 positive donor (dialysis station in red) or not (dialysis station in black)Back to article page