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Sequence of treatment: 6[R] 5-MTHF plasma concentration (ng ml−1) in patients after folic acid intake in the first period and 6[R] 5-MTHF plasma concentration (ng ml−1) in patients after folic acid intake in the second period 6[R] 5-MTHF plasma concentration (ng ml−1) in patients after 6[R,S] 5-MTHF intake in the first period and patients after 6[R,S] 5-MTHF intake in the second period.
