Litvinenko's wife Marina and their 12-year-old son Anatoly were among the mourners, PA said.

CNN: Wife, 50 friends at ex-spy funeral

But many metro areas that are usually associated with youthfulness and aspiration are producing fewer children, including Los Angeles (sixth place on our list of baby bust cities with a decline of 12.4%), New York, NY-NJ-PA (eighth, down 7%) and San Francisco-Oakland (16th, -2.7%).

FORBES: America's Baby Boom And Baby Bust Cities

The study involved stroke patients in 12 countries between 2000 and 2011, half of whom were treated with intravenous rt-PA and half were not.

BBC: Brain