“…The majority of the studies originated from the United States of America7,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,
followed by Europe8,55,56,57,58,59,60,61,62,63,64,65,66,67, Asia68-72, and Australia 73,7475,76. There
was one economic evaluation concerning enhanced asthma management30 done in 1991, and at least one between 1994 and 2012.…”