External quality assessment for tuberculosis diagnosis and drug resistance in the European Union: A five year multicentre implementation study, Nikolayevskyy, V, Hillemann D., Richter E., Ahmed N., van der Werf M.J., Kodmon C., Drobniewski F., and Ruesch-Gerdes S. , PLoS.One., 0/0/2016, Volume 11, Issue 4, p.e0152926, (2016)