| Study | ISRTCTN | NCT |
| Arcangeli 2010 | ISRCTN97182923 | NCT00392535 |
| CHHiP 2016 | ISRCTN00392535 | — |
| Fox Chase 2013 | — | NCT00062309 |
| HYPRO Dutch 2016 | ISRCTN85138529 | — |
| Lee 2016 | — | NCT00331773 |
| Lukka NCIC 2005 | — | NCT00667888 |
| MDACC 2014 | — | NCT00667888 |
| Norkus 2009 | — | — |
| PROFIT 2016 | ISRCTN43853433 | NCT00304759 |
| Yeoh 2011 | — | — |
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