Hikari Ltd aims to provide high-level quality service in scientific publishing. We combine the highest international standards of scientific quality together with efficient peer-review process. Hikari provides free access to our books and free access to all papers of published issues of our journals. Forthcoming issues and articles in press contain papers which have been peer reviewed, accepted, copy edited and formatted. Articles in press are citable but should not be considered as a final form of publication since text could still change before final publication. Access to articles in press is available for registered users (free registration is accepted), editors, authors and reviewers. Access to articles in press is freely available after a period of at most two months.