Underdosing of antiretrovirals in UK and Irish children with HIV as an example of problems in prescribing medicines to children, 1997-2005: cohort study.

Objective: To measure the extent of underdosing of antiretroviral drugs in children.

Design: Multicentre cohort study.

Setting: Clinical centres in hospitals in the United Kingdom and Ireland in the collaborative HIV paediatric study (CHIPS).