2.4. Randomization, Blinding, and the Study Protocol
DISEASES
All participants were assigned using a computer-generated randomization sequence into each study group (1:1; blocks of four). The participants and investigators were blinded to the group allocation. The mixed tocopherol used for the intervention (Nat EIn contrast, those in the placebo group received identical placebo capsules once daily for one month. Participants were encouraged to perform normal daily activities and to avoid other drugs besides the assigned intervention. However, participants could continue taking medication for underlying diseases or previous sedative drugs. 