What is the original text of this joke?

A doctor in a private clinic is planning to go abroad for a holiday, so he asked his son who just graduated from medical school to cover for one month. A month later, the doctor came back from a holiday abroad and asked his son how he was doing.

The son proudly said, "I completely cured the heart patient who you have been treating for 1 years."

Unexpectedly, my father shouted, "Bastard! You think you're smart and capable? You don't want to think, how did you get the tuition for medical school these years! "

is this the original ~