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These are best thought of as electronic letters to the editor.
To respond to a particular article
Select 'Respond to this article' in the column to the left (Full Text view) or right (PDF view) of the article.
To read rapid responses to the article
Select 'Read responses to this article' in the column to the left (Full Text view) or right (PDF view) of the article.
To receive an email alert when someone responds to a particular article
Select 'Alert me when responses are posted' in the column to the left (Full Text view) or right (PDF view) of the article.
You can select responses posted in the past 1, 2, 3, 4, 5, 6, or 7 days
