CASCADE protocol: exploring current viral and host characteristics, measuring clinical and patient-reported outcomes, and understanding the lived experiences and needs of individuals with recently acquired HIV infection through a multicentre mixed-methods - Ruiz-Burga, Elisa; Tariq, Shema; Touloumi, Giota; Gill, John; Nicholls, Emily Jay; Sabin, Caroline; Mussini, Cristina; Meyer, Laurence; Anne, Alain Volny; Carlander, Christina; others (BMJ open, 2023)