Your lower esophageal sphincter (LES) is a muscular ring that connects your esophagus with your stomach. It relaxes to let food pass through but otherwise stays closed to prevent stomach acid from ...
It had been a long day for Lt. Mariano Elias. He was awake and present at the San Francisco Fire Station 4 in the San Francisco Mission District by 7 a.m. After a brief pause for coffee, it was time ...
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