That style needs a complete reworking as they changed a lot more.
Don't go by the guidelines, but look at current papers.

You can use this style in the meantime: https://www.zotero.org/styles?q=id:european-journal-of-emergency-medicine


(1 Campbell JL, Pedersen OK. The varieties of capitalism and hybrid success. Comp Polit Stud. 2007;40(3):307–332.)