All in a day's work!

I happened to treat an infertile couple a few years ago, who were tired of various hospitals they had visited. To my surprise & their luck the lady conceived & delivered a boy.Soon after the proud father one day entered my office & declared in a loud voice"Thank you Doctor, it was all your effort!" To my discomfiture, some of the other patients & a couple of medical service representatives present, glanced mischiveously in my direction. I had to save the day saying to the new father"It was your effort, & my advice!"