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Inclusion and exclusion criteria for this systematic review.
| Inclusion Criteria | |
| (i) Studies involving humans | |
| (ii) English language publication | |
| (iii) Studies published from inception of database to February 2014 |
|
| Exclusion Criteria | |
| (i) Use of LD techniques on animal models | |
| (ii) Non-English language publication | |
| (iii) Purely technical descriptions of the use of LD techniques with no analysis of outcomes |
