Which endnote citation style should I use to get similar output as:
List all authors up to 6; for 7 or more list the first 3 and add ‘‘et al.’’)
Dockrell H, Greenspan JS. Histochemical identification of T- cells in oral lichen planus. Oral Surg 1979; 48: 42-49.
Thomas Y, Sosman J, Yrigoyen O, et al. Functional analysis of human T- cell subsets defined by monoclonal antibodies. I. Collaborative T-T interactions in the immunoregulation of B-cell differentiation. J Immunol 1980; 125: 2402-2405.
You can always edit an existing style to match your criteria.
need more info though: numbered or (Author, Year) if numbered how in the text and ordered by appearance or alphabetical? What about requriements for other publication types? Is there a website that has more details? What is the publisher, publication name? Have you already checked http://endnote.com/downloads/styles
Often other publicatons by the same publisher, have similar styles, so you can check that in the http://endnote.com/downloads/styles page too