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The Journal of the Royal Institute of Thailand Volume IV - 2012 178  2) the maintenance and care of experimental animals comply with the Thai Na- tional Institutes of Health Guidelines for the humane use of laboratory animals or the equivalent country authority or agency; 3) approval is obtained from the relevant ethical committee. References References in the text are listed by giving the surnames of authors (if there are more than two, use “et al.”.), the year of publication and the page number. References at the end of the article must be given in alphabetical order and all authors must be listed; never use “et al.” Authors are indicated by their last names followed by a space and their initial(s). or fi rst name as the case may be. Authors’ names are separated by commas only. The year of publication follows the fi nal name, preceded by a comma. The title of the book should be in italics and followed by the place and name of the publisher. Consult Index Medicus or other sources for the correct abbreviation of the journal cited. Examples of References in the text: Articles: ( Chotivanich et al., 2002: 1538-1541). Books: ( Olive, 1995: 129-131). Examples of References at the end of the article: Articles: Chotivanich KT, Udomsangpetch R, Mcgready R, Stephane P, Newton P, Pukrittayakamee S, Looareesuwan S, White NJ, 2002. Central role of the spleen in malaria parasite clearance. J Infect Dis , 185: 1538-1541. Books: Olive EA, 1995. Lymphatic Filariasis Infection and Disease. London: Academic Press. The Journal of the Royal Institute of Thailand (JRIT)