控制两行之间的垂直间距

Question

我希望能够控制#2和之间的垂直分隔#3。我该怎么办？我不希望此功能包含任何嵌套列表或居中环境，因为这样会导致 错位#3。

\documentclass[a4paper,10pt]{article}

\ExplSyntaxOn

\NewDocumentCommand{\dkmKtlog}{ O{0.3cm} m m }
  {
    \begingroup
      \setlength{\parindent}{0pt}
      \setlength{\leftskip}{#1}
      \hspace*{-\leftskip}
      \parbox[b]{\linewidth}{\normalfont\bfseries [#2]}\par
      \nopagebreak\ignorespaces #3\par
    \endgroup
  }

\ExplSyntaxOff

\begin{document}

\dkmKtlog[0cm]{1999-DEF8}{
  Deligne Pierre, Etingof Pavel, et al., 1999; ``Quantum Fields and
  Strings: A Course for Mathematicians.''  Vol. 1--2. With Freed Daniel
  S., Jeffrey Lisa C., Kazhdan David, Morgan John W., Morrison David R.,
  Witten Edward.
}

\end{document}