| Study | Reason for exclusion |
|---|---|
| Cappellini 2006 | Intervention other than calcium channel blocker. |
| Chirnomas 2009 | Intervention other than calcium channel blocker. |
| Lai 2010 | Intervention other than calcium channel blocker. |
| NCT00115349 | Intervention other than calcium channel blocker (trial terminated). |
| NCT00712738 | Not a randomised controlled trial. |
| NCT01927913 | Intervention other than calcium channel blocker (trial withdrawn). |
| NCT02173951 | Intervention other than calcium channel blocker. |
| NCT02671695 | Comparator arm other than standard chelation therapy (Spirulina). |
| Neufeld 2012 | Intervention other than calcium channel blocker. |
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