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  Indian J Med Microbiol
 

Figure 1: Protocol for randomized, double-blinded, placebo-controlled, crossover trial of inhalation of true and placebo hydrogen gas for 4 weeks. Note: The odor stick identification test for Japanese (OSIT-J), the Unified Parkinson's Disease Rating Scale scores 1 and 2 (UPDRS1 and UPDRS2), and quantification of urinary 8-hydroxy-2′-deoxyguanine (8-OHdG) normalized for urinary creatinine (Cre) were performed at the indicated time points. w: Weeks.

Figure 1: Protocol for randomized, double-blinded, placebo-controlled, crossover trial of inhalation of true and placebo hydrogen gas for 4 weeks. 
Note: The odor stick identification test for Japanese (OSIT-J), the Unified Parkinson's Disease Rating Scale scores 1 and 2 (UPDRS1 and UPDRS2), and quantification of urinary 8-hydroxy-2′-deoxyguanine (8-OHdG) normalized for urinary creatinine (Cre) were performed at the indicated time points. w: Weeks.