Bibliography (6):

1. Bridge Swallowing Exercise for Gastroesophageal Reflux Disease Symptoms: A Pilot Study

2. Self-induced Increase of Gut Motility and the Control of Parasitic Infections in Wild Chimpanzees

3. The unreasonable effectiveness of my self-experimentation

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Esophagus#Sphincters  :

      https://en.wikipedia.org/wiki/Esophagus#Sphincters

   2. https://en.wikipedia.org/wiki/Gastroesophageal_reflux_disease  :

      https://en.wikipedia.org/wiki/Gastroesophageal_reflux_disease

   3. https://en.wikipedia.org/wiki/Gastric_acid  :

      https://en.wikipedia.org/wiki/Gastric_acid