2.1 Search Strategy
The online literature search was conducted by two independent authors (FN and XC) from electronic databases including PubMed, Embase, and Web of Science from January 01, 2020, to December 31, 2022. The following sets of keywords were used for searching: Neuroimmune disorders, Central Nervous System Demyelinating Diseases, Multiple Sclerosis, Neuromyelitis Optica Spectrum Disorders, Myasthenia Gravis, Peripheral Nervous System Disease, chronic inflammatory demyelinating polyneuropathy combined using the operate ‘AND’ COVID 19 Vaccines, SARS Coronavirus 2 Vaccines or Vaccination. (The detailed search strategy is provided in Supplementary Table 1.) The eligible titles were combined and non–English-language titles and duplicates were removed. The titles and abstracts were then reviewed by two reviewers (FN and XC) independently. Full texts were screened after the preliminary screening of relevant titles and abstracts. Ambiguity was resolved after a discussion with a third reviewer (ZR).