After confirmation of all eligibility criteria, absence of exclusion criteria, and obtaining written informed consent, eligible participants will be individually allocated to the intervention and control groups in a 1:1 ratio.
A permuted block randomization method with variable block sizes will be used. Block sizes of 4 and 6 will be used to reduce the predictability of the allocation sequence. Within each block, the number of allocations to the intervention and control groups will be equal.
The random allocation sequence will be generated using SPSS statistical software by an individual who is independent of participant screening, recruitment, baseline assessment, and intervention delivery. Eligible participants will be assigned sequential identification numbers according to their order of enrollment, and each participant will be allocated to either the intervention or control group according to the pre-generated randomization sequence.
The individual participant will be the unit of randomization, and cluster randomization will not be used. Stratified randomization will not be applied.
To ensure allocation concealment, the allocation sequence will be placed in sequentially numbered, opaque, sealed envelopes. The envelopes will be prepared before participant recruitment by an individual independent of participant screening, recruitment, and intervention delivery.
After final confirmation of eligibility and obtaining written informed consent, the envelope corresponding to the participant's identification number will be opened and the assigned group will be revealed. The envelopes will be securely stored with restricted access until allocation. The researcher responsible for screening and recruitment will remain unaware of the participant's upcoming group assignment until allocation.
No quasi-random allocation method, including allocation according to the day of attendance, date of birth, medical record number, odd/even numbers, or any other predictable procedure, will be used.