You are eligible to take part in the study if you are:
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aged 18 years or older.
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willing to return in approximately 12 weeks if you are a man, or in 16 weeks if you are a woman (Stage 1 only).
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willing to undergo additional haemoglobin measurements
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willing to provide a small sample of blood for research, even if your haemoglobin levels are slightly below the threshold for donating blood
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willing to complete an online questionnaire at home (and, thus, provide your email address).