A 30-year-old woman presents with bilateral knee joint swelling and pain for 6 months, and recent fever with facial edema. Physical exam: temperature 38°C, facial edema, oral mucosal ulcers, liver palpable 1 fingerbreadth below the costal margin, spleen palpable 2 fingerbreadths below the costal margin, bilateral knee joint swelling with erythema, swelling, and tenderness, BP 150/90 mmHg (20/12 kPa). Urinalysis shows no proteinuria. ANA(+) and anti-Smith (anti-Sm) antibody (+), diagnosed with systemic lupus erythematosus (SLE). After treatment, her condition improved, and she was discharged. The doctor advised her on post-discharge preventive measures. Which of the following is INCORRECT?