Patients generally choose it because it's done in a single procedure and they want a more natural result, McCarthy says.

CNN: How surgeons build new breasts

"It is not standard practice or recommended procedure for a single pilot to read newspapers while operating an aircraft, " a spokesman for the trade group says.

WSJ: Executive No-Fly Zone? When a CEO's Thrill-Seeking Rattles the Board

To make it easier to do it right, some ICUs now gather all the equipment needed on a single cart ahead of time and give nurses permission to halt a central line procedure if they see a doctor doing it wrong.

FORBES: On The Cover/Top Stories

The procedure sees the surgeon operate through a single cut, minimising the chance of scarring.

BBC: Ninewells Hospital to use new keyhole surgery technique

In general, standard operating procedure in microscopy is a private, one-on-one, single user experience.

FORBES: The Socialization of Microscopes