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We are glad to hear from readers. Corrections are especially welcome: if a number in a dilution chart looks wrong, or a guideline has changed since we wrote about it, please let us know and we will check it.

A few things we cannot do:

• We cannot give advice about your own symptoms, medicines or test results. Please ask your doctor or pharmacist; if it is urgent, call your local emergency number (119 in Japan).
• We do not review products, accept guest posts or sell links.

Letters go straight to the editors and we try to reply within a week or two.