group outcome control survived control survived control survived control survived control survived control survived control survived control survived control survived control survived control survived control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died control died treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment survived treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died treatment died