Patient perception of mobile phone apps for the care and prevention of sexually transmitted diseases: cross-sectional study - Jakob, Lena (Verfasser); Steeb, Theresa (Verfasser); Fiocco, Zeno (Verfasser); Pumnea, Teodora (Verfasser); Jakob, Sophia Nomi (Verfasser); Wessely, Anja (Verfasser); Rothenberger, Christoph Clemens (Verfasser); Brinker, Titus Josef (Verfasser); French, Lars Einar (Verfasser); Berking, Carola (Verfasser); Heppt, Markus V. (Verfasser) (JMIR mhealth and uhealth)