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Data Availability Data are available on Open Science Framework ( Ethics Approval Ethical approval was provided by the UCL Research Ethics Committee (0498/001)

Avoid the following: Do not assume repeated blood is normal Do not ignore shortness of breath or chest pain Do not stop blood thinners without medical advice Do not smoke or vape to test whether it worsens Do not take leftover antibiotics without a prescription Do not delay care if the amount of blood increases Do not assume it is only from the throat if blood is visible in mucus Note: A metallic taste alone may be minor, but coughing up blood should be taken seriously