RT Journal Article SR Electronic T1 Two sputum samples at once for diagnosis of tuberculosis in Africa has equivalent sensitivity and specificity to the standard initial sample followed by a morning sample strategy JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 173 OP 174 DO 10.1136/ebm.2011.100197 VO 16 IS 6 A1 Safdar, Nauman A1 Siddiqi, Kamran YR 2011 UL http://ebm.bmj.com/content/16/6/173.abstract AB