Texas Children’s Hospital in Houston is the largest children’s hospital in the world. They treat more than four million patients under the age of 21 every year, most of them minors. And because of the hospital’s size and prestige, what happens at TCH doesn’t just affect those patients. What happens at TCH also influences how other major children’s hospitals all around the country conduct their operations.That’s what makes the reporting out of Texas Children’s Hospital this year — most of it done b …