Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
snip
"Its worth noting that Wojcicki is a biologist and the cofounder of 23andme, the innovative personal genetics company."
(23andme has been a topic here on this forum.)
http://venturebeat.com/2013/02/20/mark-zuckerberg-sergey-brin-yuri-milner-launch-33m-breakthrough-prize-in-life-sciences/#AJD71ZZc1ubVMStI.99