**2. Definition**

In 2012, a large group of researchers from Africa, Asia, America, Europe, and the Pacific suggested that the term 'defaulter' is inappropriate for the patient [1]. Instead, they recommended using the term 'person lost to follow-up' to become more patientcentered. In 2013, the WHO decided to use the term 'loss to follow-up' instead of 'defaulter' for reporting treatment outcomes because the former is less judgmental [2]. They defined LTFU as "A TB patient who did not start treatment or whose treatment was interrupted for 2 consecutive months or more." Since then, several papers have started reporting according to this new term and definition [3–10].
