“…The average asthma-related direct costs of care in developed countries ranged between $273 in Australia, $1779 in Switzerland, and up to $4101 in the United States of America per patient annually [5,17,18]. In developing countries, average direct costs of asthma care per patient annually ranged between US$135 in Thailand, US$276 in Malaysia, and US$1,466 in Turkey [10,12,19]. In the USA and Turkey, the total cost of asthma was estimated as US$12.7 billion and US$1.9 billion, in 1998 and 2004, respectively [10,14].…”