1 <sup>*</sup>Norwich Medical School, University of East Anglia, Norwich, UK.
2 <sup>†</sup>KNCV Tuberculosis Foundation, The Hague, The Netherlands.
3 <sup>‡</sup>Department of Medicine, Karolinska Institutet, Stockholm, Sweden, <sup>§</sup>Department of Internal Medicine, University of Perugia, Perugia, Italy.