Fig. 1.

Underlying conditions observed in the patient cohort. (A) Venn diagram describing the study cohort. (B) Percentage of patients with underlying conditions reported in the cohort. (C) Percentage of underlying conditions and in combinations. Others include Parkinson’s disease (n = 2), high haemoglobin levels (polycythaemia) (n = 1), seizure disorders (n = 1), hysterectomy (n = 1) and open-heart surgery (n = 1). (D) Number of patients who had reported having one, two and three or more underlying conditions.