Remove the 'and' between the last and second last authors in biblatex?

Question

I'm trying to make my biblatex references match this Vancouver style guide. After some tweaking, my biblatex references are almost exactly how I want them, with one exception. The word and is inserted between the last and second last authors.

How can I remove the word 'and' between the last and second last authors?

Here is a MWE:

\documentclass{article}

% nejm style gets us close.
\usepackage[style=nejm, terseinits=true]{bib latex}

% This bit makes sure the last names come before the initials.
\DeclareNameAlias{default}{last-first}
\renewcommand*{\revsdnamepunct}{}

% This puts the volume number in parentheses.
\renewbibmacro*{volume+number+eid}{%
    \printfield{volume}%
    \printfield{number}%
    \setunit{\addcomma\space}%
    \printfield{eid}}
\DeclareFieldFormat[article]{number}{\mkbibparens{#1}}

\begin{filecontents}{references.bib}
    @article{kenkre_simple_1997,
      title = {Simple Solutions of the {{Torrey}}–{{Bloch}} Equations in the {{NMR}} Study of Molecular Diffusion},
      volume = {128},
      url = {http://www.sciencedirect.com/science/article/pii/S1090780797912167},
      number = {1},
      journaltitle = {J. Magn. Reson.},
      author = {Kenkre, V. M. and Fukushima, Eiichi and Sheltraw, D.},
      urldate = {2017-02-07},
      date = {1997-06},
      pages = {62--69},
}

\end{filecontents}
\addbibresource{references.bib}

\begin{document}
    Here is a reference \parencite{kenkre_simple_1997}.
    \printbibliography
\end{document}

Answer 1

You can redefine \finalnamedelim, but note that it is language dependent. So you have to use \DeclareBibliographyExtras:

\documentclass{article}

% nejm style gets us close.
\usepackage[style=nejm, terseinits=true]{biblatex}

% This bit makes sure the last names come before the initials.
\DeclareNameAlias{default}{last-first}
\renewcommand*{\revsdnamepunct}{}

% This puts the volume number in parentheses.
\renewbibmacro*{volume+number+eid}{%
    \printfield{volume}%
    \printfield{number}%
    \setunit{\addcomma\space}%
    \printfield{eid}}
\DeclareFieldFormat[article]{number}{\mkbibparens{#1}}

\addbibresource{biblatex-examples.bib}
\DefineBibliographyExtras{english}{%
  \renewcommand*{\finalnamedelim}{\addcomma\addspace}%
}

\begin{document}
    Here is a reference \parencite{yoon}.
    \printbibliography
\end{document}