The References section must include all journal articles (both print and online), books and book chapters (both print and online), patents, theses and dissertations, published conference proceedings, meeting abstracts from published abstract books or journal supplements, letters (to the editor), and company publications, as well as in-press journal articles, book chapters, and books (publication title must be given). Please adhere strictly to the reference style of the journal. The reference style is ‘Embellished Vancouver’ system with numbers in the text. Indicate references by superscript numbers in the text. The actual authors can be referred to, but the reference number(s) must always be given. Number the references in the list in the order in which they appear in the text. Since title and byline information that is downloaded from PubMed does not show accents, italics, or special characters, authors should refer to the PDF files or hard-copy versions of the articles and incorporate the necessary corrections in the submitted manuscript. References to journals should contain names and initials of the author(s), article title, abbreviation of the name of the journal according to the List of Serial Title Word Abbreviations (International Serials Data System, 20, rue Bachaumont, 75002 Paris, France, ISBN 2-904938-02-8), year, volume number and page numbers. References to books should also include the title (of series and volume), initials and names of the editor(s), publisher, place of publication, year. For more than 6 authors the first 6 should be listed followed by ‘et al.’ The initial version of a paper published online can be cited by the Digital Object Identifier (DOI) but, if available, the reference should also include the citation of the final version. Authors should check all references carefully and in particular ensure that all references in the Reference section are cited in the text and vice versa. Note that multiple references or page spans under one number are not allowed. Personal communications, unpublished results, manuscripts submitted or in preparation, statistical packages, computer programs and web sites should be cited in the text only, NOT included in the References section. Accession numbers may be cited either within the text or in the form of a reference.