Of the 16 studies included in this first version of the review, five studies did not use a cross‐sectional design. Three studies were diagnostic case‐control studies (Nobel 2020; Yang 2020d; Zhao 2020a), one study selected cases cross‐sectionally in five hospitals but only selected cases in one hospital (Chen X 2020), and one study emailed patients who had undergone testing for SARS‐CoV‐2 about olfactory symptoms prior to the SARS‐CoV‐2 test, with a response rate of 58% in SARS‐CoV‐2 positive cases and 15% in negative cases (Yan 2020a).