When do you want me to start? <a href=" http://www.coventrydg.co.uk/index.php/is-there-a-generic-equivalent-for-nexium.pdf ">what is esomeprazole magnesium used for</a> The U.S. has been formulating its response to an alleged chemical attack carried out by Syrian forces that killed hundreds of civilians last month. "These are crimes against humanity and they cannot be tolerated," Kerry warned.