Fig. 1

Distribution of presenting symptoms. Pain consisted of joint pain (56 %), abdominal pain (22 %), muscle pain (11 %) or pain somewhere else (17 %) (asterisk). Constitutional symptoms included tiredness, light-headedness, fatigue, nausea and vomiting (dagger). Pulmonary symptoms included dyspnoea, coughing and pain during respiration (Pi). Dullness, mental confusion and a loss of concentration were signs of mental symptoms (not sign). Symptoms of vision involved blurry vision and diplopia (Yen). Musculoskeletal symptoms included muscle cramps and stiffness (letter O with stroke)