Analysis 1.1. Comparison 1 Citrate salts versus placebo or no intervention, Outcome 1 Reduction in stone size.. . Analysis 1.2. Comparison 1 Citrate salts versus placebo or no intervention, Outcome 2 New stone formation.. .. Analysis 1.3. Comparison 1 Citrate salts versus placebo or no intervention, Outcome 3 Stone size stability.. .. . Analysis 1.4. Comparison 1 Citrate salts versus placebo or no intervention, Outcome 4 Urinary citrate levels.. .. Analysis 1.5. Comparison 1 Citrate salts versus placebo or no intervention, Outcome 5 Adverse events.. .. . .