The TEST study will recruit children via research-active GP surgeries across Bristol, South Gloucestershire and North Somerset, who will be asked to send out invitation letters to parents/carers of potentially eligible children through the post.

The following 16 GP surgeries have agreed to take part:

• Portishead Medical Group
• Beechwood Medical Practice, Fishponds
• The Wellspring Surgery, Redfield
• The Cedars Surgery, Weston-super-Mare
• Greenway Community Practice, Southmead
• Westbury on Trym Primary Care Centre
• The Lennard Surgery, Bedminster
• Tyntesfield Medical Group (Nailsea Medical Centre, Backwell and Nailsea Medical Group, Long Ashton Surgery)
• Concord Medical Centre, Little Stoke
• West Walk Surgery, Yate
• Streamside Surgery, Thornbury
• Charlotte Keel Medical Practice, Easton
• Broadmead Medical Centre
• Pembroke Road Surgery, Clifton
• The Family Practice, Cotham
• Whiteladies Medical Group, Clifton