Line 21:1·A bold element in the History and etymology section should be a person; it would be useful to have their lifespan details: '<h4>History and etymology</h4> <p>The procedure was introduced by <strong>William H Muller, Jr</strong> '
Oxford Comma
suggestion
"The procedure was introduced by William H Muller, Jr and J Francis Dammann, Jr in 1951 and was initially used in an infant with a ventricular septal defect."
Line 22:54·Use the Oxford comma in 'Muller, Jr and J'.