Hello, I believe the citation style for 'the pharmacogenomics journal' is incorrect- it appears to list citations with 6+ authors as first auther, etal. but the website instructions say:
References should follow the Vancouver format. In the text they should appear as numbers starting at one and at the end of the paper they should be listed (double-spaced) in numerical order corresponding to the order of citation in the text. All authors should be quoted for papers with up to six authors; for papers with more than six authors, the first six only should be quoted, followed by et al. Abbreviations for titles of medical periodicals should conform to those used in the latest edition of Index Medicus. The first and last page numbers for each reference should be provided. Abstracts and letters must be identified as such. Papers in press and papers already submitted for publication may be included in the list of references but no citation is required for work that is not yet submitted for publication.

I got around this just by using the 'vancouver' option, but if specific journal is listed, should be accurate- perhaps this style was meant for another pharmacogenomics journal, the titles are confusing.

Thanks