The chances of securing a liver transplant are slim to begin with, but they also vary widely by geography.Just 7,000 livers are donated each year, but more than 16,000 Americans are awaiting transplants as they fight conditions like cancer and hepatitis.

Pakistan police have stepped up efforts to stop illegal organ trading following the recent discovery of 24 people held by force in a locked apartment waiting to be operated on at a nearby clinic.   Although illegal organ trafficking had slowed in recent years, officials say…