The tuberculin skin test: a comparison of ruler and calliper readings

Authored by: Geldenhuys H., Verver S., Surtie S., Hatherill M., van Leth F., Kafaar F., Tameris M., Kleynhans W., Luabeya K. K., Moyo S., Sikhondze W., Hanekom W., Mahomed H.
In: INTERNATIONAL JOURNAL OF TUBERCULOSIS AND LUNG DISEASE 14(10), 2010, p.1266-1271
http://www.ncbi.nlm.nih.gov/pubmed/20843417