\begin{thebibliography}{1}

\providecommand{\natexlab}[1]{#1}
\providecommand{\url}[1]{\texttt{#1}}
\providecommand{\urlprefix}{URL }
\providecommand{\eprint}[2][]{\url{#2}}

\bibitem[{Hengartner et~al.}(2017){Hengartner, Kruger, Geraedts, Tronci, Mancini, Ille, Egli, R{\~A}{\textparagraph}blitz, Ehrig, Saleh, Spanaus, Schippert, Zhang \& Leeners}]{Hengartner_etal2017} M. P. Hengartner, T. H. C. Kruger, K. Geraedts, E. Tronci, T. Mancini, F. Ille, M. Egli, S. R{\~A}{\textparagraph}blitz, R. Ehrig, L. Saleh et al. "Negative affect is unrelated to fluctuations in hormone levels across the menstrual cycle: Evidence from a multisite observational study across two successive cycles." \textit{Journal of Psychosomatic Research} 99 (2017): 21--27. DOI: 10.1016/j.jpsychores.2017.05.018.

\end{thebibliography}

