| Database | Date of Search | Search terms |
| ClinicalTrials.gov | 31 July 2015 and 02 February 2018 | #1 "sickle cell" OR "haemoglobin S disease" OR "haemoglobin S disorder" OR "HbS disease" #2 "folic acid" OR folate OR "vitamin B9" OR "vitamin B‐9" OR metafolin OR levomefolate OR folvite OR folacin OR 5‐methyltetrahydrofolate OR 5‐methylTHF #1 AND #2 Results: 9 |
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