Table 1 Methods and timing of sampling. Methods are characterised further in Additional documentation

Vitamin D

x

x

x

Calcium and bone metabolism

x

x

x

x

Inflammatory markers

x

x

x

DNA

x

x

x

Bone densitometry

x

x

Infection records

x

x

x

Allergy questionnaire

x

x

x

Specific allergic responses (IgA, IgE)

x

x

Iron status

x

x

Dietary survey

x^a

x

x

x

Neurological scales

x

x

Family sociodemographic and lifestyle

x

x

Neurocognitive development scales

x

x

Mental health and behaviour

x

x

x

Clinical assessment

x

x

x

Health records

x

x

x

x

Viral and bacterial swab

x

x