During the past year we have received several submissions which were not in accordance to author guidelines. We urge all authors to carefully read the author guidelines before submitting articles. Incorrectly formatted articles prolong processing times. Please make sure that the submitted article is in word format and has the title, key words and abstract in the first author's native language as well as English. Further instructions are available here.We also urge our users to update their personal information regarding fields of scientific and professional interest, affiliation, bio statement, etc. Users can update their personal information by clicking on the My profile link.