References.References should be listed in consecutive numerical order as they are cited in the text, not alphabetically. Once a reference is cited, all subsequent citations should be to the original number. All references must be cited in the text or tables. Unpublished data and personal communication are not encouraged and may not be listed as references. References to journal articles should include, in this order, (1) authors (list all authors and/or editors up to 6; if more than 6, list the first 3 and "et al"), (2) title, (3) journal name as abbreviated in Index Medicus, (4) year, (5) volume number, and (6) inclusive page numbers. References to books should include (1) authors (list all authors and/or editors up to 6; if more than 6, list the first 3 and "et al"), (2) chapter title, if any, (3) editor, if any, (4) title of book, (5) year, (6) city, and (7) publisher. Volume and edition numbers, specific pages, and name of translator should be included when appropriate.The author is responsible for the accuracy and completeness of the references and for their correct text citation.