Non-pharmacological therapies for postviral syndromes, including Long COVID: a systematic review and meta-analysis protocol oleh Kamlesh Khunti, Krishnarajah Nirantharakumar, Christel McMullan, Melanie Calvert, Joht Singh Chandan, Sarah E Hughes, Richard Hotham, Shamil Haroon, Kirsty Brown, Manoj Sivan, Jenny Camaradou, Grace Turner, Olalekan Lee Aiyegbusi, Samantha Cruz Rivera, Dominic Heining, Devan Raindi, Nikita Simms-Williams, Nasir Bashir, Steven Marwaha