Study protocol of a randomized controlled trial evaluating home treatment with peer support for acute mental health crises (HoPe) per Britta Reinke, Candelaria Mahlke, Christina Botros, Alexa Kläring, Martin Lambert, Anne Karow, Jürgen Gallinat, Antonia Zapf, Ann-Kathrin Ozga, Alexandra Höller, Nadia Bustami, Jens Reimer, Jenny Lüdtke, Oliver Schaper, Martin Lison, Andreas Bechdolf, Johanna Baumgardt, Jennifer Spiegel, Olaf Hardt, Sandeep Rout, Sonja Memarzadeh, Sebastian von Peter, Julian Schwarz, Claudia Langer, Sabine Glotz, Karel Frasch, Nicolas Rüsch, Ulf Künstler, Thomas Bock, Thomas Becker