| Trials registry | Search terms | Date last searched |
| ClinicalTrials.gov (clinicaltrials.gov) |
vitamin K AND cystic fibrosis | 12 August 2019 |
| International Standard Randomised Controlled Trials Number (ISRCTN) Registry (www.isrctn.com/) |
vitamin K AND cystic fibrosis | 12 August 2019 |
| WHO International Clinical Trials Registry Platform (ICTRP) (WHO ICTRP) |
vitamin K AND cystic fibrosis | 12 August 2019 |
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