Table 1 Schedule of visits

Patient attends the health clinic

X

X

X

X

X

Telephone review

X

Identification of eligible subjects

X

Check eligibility

X

Obtain informed consent

X

Blood sampling

X

X

X

Stool sampling

X

X

X

Provision of test product

X

X

X

Return of previously provided test product

X

X

X

Assessment of compliance and adverse events

X

X

X

X