The second interview was held by telephone 6–8 weeks
after the first interview. The second interview was not conducted
personally due to concerns that some patients would
not come and it would cause bias if some of the second
interviews were made by telephone and some personally.
The data collected included information on the cannabis
use, such as regular use or interrupted. If the treatment
stopped, the reasons for stopping were documented. Patients
who continued the treatment were asked again about cancer
symptoms or chemotherapy-related side effects and possible
cannabis side effects.