Federal Reserve Chair Janet Yellen did not comment on the U.S. economy or monetary policy in brief welcoming remarks to a community banking symposium on Wednesday. It was Yellen’s first public appearance since a health scare last week in Massachusetts in which she stumbled over her words and struggled to complete a nearly hour-long speech. The Fed said at the time she suffered from dehydration after a long day, and was cleared by an emergency medical technician to proceed with a planned dinner that evening.