“…The original research articles are dedicated to specific studies performed in different countries and population groups [ 28 , 29 , 30 , 31 , 32 , 33 ], with different approaches to selection criteria, key agents, nosology, and definitions [ 34 , 35 , 36 , 37 , 38 ], and different methods of diagnostics and treatment, as well as measuring the patients’ reported outcomes [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ]. The results range from an inconclusive interaction between COVID-19 and ME/CFS to assumptions about the analogy of post-COVID-19 syndrome with ME/CFS.…”