| Study | Methods | | Participants | Follow-up |
| Forster et al., 2001 [9] | Cohort-observational | 25 | 19 DG, 3 IG, and 3 PSG | 12 months | Abell et al., 2002 [10] | Cohort-observational | 38 | 9 DG, 24 IG, and 5 PSG | 11 months | Abell et al., 2003 [22] | Crossover and then observational | 33 | 17 DG, 16 IG | 12 months | Abell et al., 2003 [26] | Cohort-observational | 12 | 3 DG, 9 IG | 60 months | Forster et al., 2003 [27] | Cohort-observational | 55 | 39 DG, 7 IG, and 9 PSG | 12 months | Lin et al., 2004 [23] | Cohort-observational | 48 | 48 DG | 12 months | McCallum et al., 2005 [17] | Cohort-observational | 16 | 16 PSG | 12 months |
van der Voort et al., 2005 [18] | Cohort-observational | 17 | 17 DG | 12 months | Lin et al., 2005 [24] | Cohort-observational | 37 | 24 DG, 8 IG, and 5 PSG | 12 months | Mason et al., 2005 [33] | Cohort-observational | 29 | 24 DG, 5 IG | 20 months | Lin et al., 2006 [25] | Cohort-observational | 55 | 39 DG, 9 IG, and 6 PSG | 36 months | Anand et al., 2007 [28] | Cohort-observational | 214 | 146 IG, 45 DG, and 23 PSG | 48 months | Lin et al., 2008 [12] | Cohort-observational | 63 | 38 DG, 11 IG, and 14 PSG | 12 months | McKenna et al., 2008 [15] | Cohort-observational | 19 | 10 DG, 6 IG, and 3 PSG | 9.5 months | Brody et al., 2008 [13] | Cohort-observational | 50 | 20 DG, 25 IG, 2 PSG, and 3 CTG | 12 months | McCallum et al., 2010 [16] | Crossover and then observational | 55 | 55 DG | 12 months | McCallum et al., 2011 [29] | Cohort-observational | 221 | 142 DG, 48 IG, and 31 PSG | 56 months | O’Loughlin et al., 2013 [30] | Cohort-observational | 17 | 9 DG, 7 IG, and 1 PSG | 14 months | McCallum et al., 2013 [19] | Crossover and then observational | 32 | 32 IG | 12 months | Ross et al., 2014 [32] | Cohort-observational | 25 | 15 DG, 10 IG | 6 months | Brody et al., 2015 [14] | Cohort-observational | 79 | 43 IG, 37 DG | 12 months |
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