Conception of a mobile health application targeting early postoperative physiotherapeutic care after total knee replacement, a qualitative study - Hakam, Hassan Tarek; Ramadanov, Nikolai; Garzuzi, Awda; Salzmann, Mikhail; Hofmann, Hannes; Muehlensiepen, Felix; Becker, Roland; Prill, Robert (Frontiers in Surgery, 2025)