COVID-19(8) Cancer(3) Patient(2) SARS-CoV-2(2) hepatitis B(2) men(2) oncology(2) Future(2) collected(2) asked(1) retrospective(1) Engagement(1) 6MWT distance(1) IgG(1) Quality(1) exercise(1) women(1) Hepatitis B reactivation(1) mRNA vaccine(1) Inflammatory biomarker(1) emotional(1) interleukin-6(1) cancer patient(1) Vietnam(1) report(1) intervention group(1) cancer diagnosis(1) Survival.(1) Infection(1) IL-5(1)