LONDON (AP) - Queen Elizabeth II missed out on the Remembrance Sunday service in London to pay tribute to Britain's war dead because she sprained her back, Buckingham Palace said Sunday.The service is one of the most important events on the 95-year-old monarch's calendar, and was meant to be her first public appearance after taking a few weeks off to rest under doctor’s orders.British media reported that the back sprain was not believed to be related to the recent medical advice to rest that prompted other cancellations.RELATED: Doctors advise Queen Elizabeth II to rest for 2 weeks"The Queen, having sprained her back, has decided this morning with great regret that she will not be able to attend today’s Remembrance Sunday service at the.