Information sources and search strategy
Three reviewers independently searched the databases PubMed, Cochrane
Library, Science Direct, Ovid, Springer Link, Google Scholar, and
ClinicalTrials.gov (https://clinicaltrials.gov). The search algorithm
includes: (((((((Postbiotics) OR (Paraprobiotics)) OR (Ghost
probiotics)) OR (Parapsychobiotics)) OR (Tyndallized probiotics)) OR
(Metabiotics)) OR (Bacterial lysates)) AND (Atopic dermatitis). Some
studies involve postbiotics but may not explicitly mention this term or
its related terms; instead, they may only describe its inanimation
process and the specific microorganism used. Thus, individual probiotic
strains reported in the SR on the probiotics of Tan-Lim et
al., 23 were also used as search terms for the PubMed
database. Search for additional references cited in the screened
full-text papers was also performed.24 Search for
unpublished articles was done by correspondence with content experts in
the field.