national library medicine no et al. and paretheses, not brackets

Hello - I need the NLM style, without et. al., and with parentheses, not brackets. Currently there are 4 versions of NLM, one with no et al but it's got brackets and one with parenth but it has et al. I cannot get the style to edit in my program (when I open the editor, the NLM styles do not show up!), is there a way to get a version uploaded without et. al., and with parentheses, not brackets?
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