I have listed the Springer, Elsevier Science Direct, SAGE, NLM Drug information portal , individual electronic journals and other databases as good sources to search.
For #14 (Sami) Use the MDMA synonym ecstasy with PTSD
Use the drug name or synonym listed in Pubmed's MeSH database for search results.
#9 (Pritts) The Sage, Elsevier and Springer databases have articles about music therapy. Cochrane has music intervention articles that may interest you as comparisons : Cochrane Database of Systematic Reviews Music‐based therapeutic interventions for people with dementia
#25(Ferrara) PMC and Pubmed are good sources for fecal microbiota transplant IBD systematic review meta analysis