Quality of Life Questionnaire Validation for Patients With Changed Tacrolimus Dosing After Kidney Transplantation

Inclusion Criteria Selection criteria for in-depth interview subjects: * One male or female aged 30 or over but below 40 years old. * One male or female aged 60 or over but below 70 years old. * One male or female with an occupation. * One male or female without an occupation. * Two subjects, depending on the number of medications (more or less medications) that the subject is taking. * Participation available Period: subjects who have received tacrolimus twice daily (b.i.d) for a minimum of 6 months to a maximum of 12 months after surgery and who are within 1 month of switching to Advagraf (once daily (q.d) regimen of modified release tacrolimus). * Subjects who understood the purpose and risks of the questionnaire development and who were well-acquainted with the contents and submitted the written consent to participate in the interview for the questionnaire development. Selection criteria for validation stage subjects: 1. Males and females aged 19 to 65 years old. 2. Participation Available Period: the first survey is conducted on the subjects who have received tacrolimus twice daily (b.i.d) for a minimum of 6 months to a maximum of 12 months during the period. The second survey is conducted within one month after switching to Advagraf (once daily (q.d) regimen of modified release tacrolimus). 3. Subjects who understood the purpose and risks of the questionnaire development and who were well-acquainted with the contents and submitted the written consent to participate in the interview for the questionnaire development. Exclusion Criteria: * None.