1. Gibson PG, McDonald VM, Marks GB. Asthma in older adults. Lancet. 2010. 376:803–813.
2. Pinto Pereira LM, Seemungal TA. Comorbid disease in asthma: the importance of diagnosis. Expert Rev Respir Med. 2010. 4:271–274.
3. Zhang T, Carleton BC, Prosser RJ, Smith AM. The added burden of comorbidity in patients with asthma. J Asthma. 2009. 46:1021–1026.
4. Adams RJ, Wilson DH, Taylor AW, Daly A, Tursan d'Espaignet E, Dal Grande E, Ruffin RE. Coexistent chronic conditions and asthma quality of life: a population-based study. Chest. 2006. 129:285–291.
5. Gershon AS, Wang C, Guan J, To T. Burden of comorbidity in individuals with asthma. Thorax. 2010. 65:612–618.
6. Yoo KH, Kim YS, Sheen SS, Park JH, Hwang YI, Kim SH, Yoon HI, Lim SC, Park JY, Park SJ, Seo KH, Kim KU, Oh YM, Lee NY, Kim JS, Oh KW, Kim YT, Park IW, Lee SD, Kim SK, Kim YK, Han SK. Prevalence of chronic obstructive pulmonary disease in Korea: the fourth Korean National Health and Nutrition Examination Survey, 2008. Respirology. 2011. 16:659–665.
7. Miller MR, Hankinson J, Brusasco V, Burgos F, Casaburi R, Coates A, Crapo R, Enright P, van der Grinten CP, Gustafsson P, Jensen R, Johnson DC, MacIntyre N, McKay R, Navajas D, Pedersen OF, Pellegrino R, Viegi G, Wanger J. ATS/ERS Task Force. Standardisation of spirometry. Eur Respir J. 2005. 26:319–338.
8. Kilpeläinen M, Terho EO, Helenius H, Koskenvuo M. Validation of a new questionnaire on asthma, allergic rhinitis, and conjunctivitis in young adults. Allergy. 2001. 56:377–384.
9. Zheng W, McLerran DF, Rolland B, Zhang X, Inoue M, Matsuo K, He J, Gupta PC, Ramadas K, Tsugane S, Irie F, Tamakoshi A, Gao YT, Wang R, Shu XO, Tsuji I, Kuriyama S, Tanaka H, Satoh H, Chen CJ, Yuan JM, Yoo KY, Ahsan H, Pan WH, Gu D, Pednekar MS, Sauvaget C, Sasazuki S, Sairenchi T, Yang G, Xiang YB, Nagai M, Suzuki T, Nishino Y, You SL, Koh WP, Park SK, Chen Y, Shen CY, Thornquist M, Feng Z, Kang D, Boffetta P, Potter JD. Association between body-mass index and risk of death in more than 1 million Asians. N Engl J Med. 2011. 364:719–729.
10. Ministry of Health and Welfare, Korea Centers for Disease Control and Prevention. National Health Statistics 2008. The fourth Korean National Health and Nutrition Examination Survey. 2010.
11. Fulop T, Larbi A, Witkowski JM, McElhaney J, Loeb M, Mitnitski A, Pawelec G. Aging, frailty and age-related diseases. Biogerontology. 2010. 11:547–563.
12. Kandane-Rathnayake RK, Matheson MC, Simpson JA, Tang ML, Johns DP, Mészáros D, Wood-Baker R, Feather I, Morrison S, Jenkins MA, Giles GG, Hopper J, Abramson MJ, Dharmage SC, Walters EH. Adherence to asthma management guidelines by middle-aged adults with current asthma. Thorax. 2009. 64:1025–1031.
13. Navarro A, Valero A, Juliá B, Quirce S. Coexistence of asthma and allergic rhinitis in adult patients attending allergy clinics: ONEAIR study. J Investig Allergol Clin Immunol. 2008. 18:233–238.
14. Bousquet J, Khaltaev N, Cruz AA, Denburg J, Fokkens WJ, Togias A, Zuberbier T, Baena-Cagnani CE, Canonica GW, van Weel C, Agache I, Aït-Khaled N, Bachert C, Blaiss MS, Bonini S, Boulet LP, Bousquet PJ, Camargos P, Carlsen KH, Chen Y, Custovic A, Dahl R, Demoly P, Douagui H, Durham SR, van Wijk RG, Kalayci O, Kaliner MA, Kim YY, Kowalski ML, Kuna P, Le LT, Lemiere C, Li J, Lockey RF, Mavale-Manuel S, Meltzer EO, Mohammad Y, Mullol J, Naclerio R, O'Hehir RE, Ohta K, Ouedraogo S, Palkonen S, Papadopoulos N, Passalacqua G, Pawankar R, Popov TA, Rabe KF, Rosado-Pinto J, Scadding GK, Simons FE, Toskala E, Valovirta E, van Cauwenberge P, Wang DY, Wickman M, Yawn BP, Yorgancioglu A, Yusuf OM, Zar H, Annesi-Maesano I, Bateman ED, Ben Kheder A, Boakye DA, Bouchard J, Burney P, Busse WW, Chan-Yeung M, Chavannes NH, Chuchalin A, Dolen WK, Emuzyte R, Grouse L, Humbert M, Jackson C, Johnston SL, Keith PK, Kemp JP, Klossek JM, Larenas-Linnemann D, Lipworth B, Malo JL, Marshall GD, Naspitz C, Nekam K, Niggemann B, Nizankowska-Mogilnicka E, Okamoto Y, Orru MP, Potter P, Price D, Stoloff SW, Vandenplas O, Viegi G, Williams D. World Health Organization. GA(2)LEN. AllerGen. Allergic Rhinitis and its Impact on Asthma (ARIA) 2008 update (in collaboration with the World Health Organization, GA(2)LEN and AllerGen). Allergy. 2008. 63:Suppl 86. 8–160.
15. Yamauchi K, Tamura G, Akasaka T, Chiba T, Honda K, Kishi M, Kobayashi H, Kuronuma T, Matsubara A, Morikawa T, Ogawa H, Ohta N, Okada M, Sasaki M, Saito J, Sano K, Satoh M, Shibata Y, Takahashi Y, Takanashi S, Inoue H. Analysis of the comorbidity of bronchial asthma and allergic rhinitis by questionnaire in 10,009 patients. Allergol Int. 2009. 58:55–61.
16. Busse PJ, Mathur SK. Age-related changes in immune function: effect on airway inflammation. J Allergy Clin Immunol. 2010. 126:690–699.
17. Dyer CA, Sinclair AJ. A hospital-based case-control study of quality of life in older asthmatics. Eur Respir J. 1997. 10:337–341.
18. Ng TP, Chiam PC, Kua EH. Mental disorders and asthma in the elderly: a population-based study. Int J Geriatr Psychiatry. 2007. 22:668–674.
19. Loerbroks A, Apfelbacher CJ, Bosch JA, Stürmer T. Depressive symptoms, social support, and risk of adult asthma in a population-based cohort study. Psychosom Med. 2010. 72:309–315.
20. Di Marco F, Santus P, Centanni S. Anxiety and depression in asthma. Curr Opin Pulm Med. 2011. 17:39–44.
21. Bozek A, Jarzab J. Adherence to asthma therapy in elderly patients. J Asthma. 2010. 47:162–165.
22. Shane Anderson A, Loeser RF. Why is osteoarthritis an age-related disease? Best Pract Res Clin Rheumatol. 2010. 24:15–26.
23. Davis MA, Ettinger WH, Neuhaus JM, Hauck WW. Sex differences in osteoarthritis of the knee. The role of obesity. Am J Epidemiol. 1988. 127:1019–1030.
24. Frangogiannis NG. The immune system and cardiac repair. Pharmacol Res. 2008. 58:88–111.
25. Kasayama S, Tanemura M, Koga M, Fujita K, Yamamoto H, Miyatake A. Asthma is an independent risk for elevation of plasma C-reactive protein levels. Clin Chim Acta. 2009. 399:79–82.
26. Aung T, Bisognano JD, Morgan MA. Allergic respiratory disease as a potential co-morbidity for hypertension. Cardiol J. 2010. 17:443–447.
27. Hardie G, Liu R, Darden J, Gold WM. Ethnic differences in methacholine responsiveness and word descriptors in African Americans, Hispanic-Mexican Americans, Asian-Pacific Islanders, and Whites with mild asthma. J Asthma. 2010. 47:388–396.
28. van Vliet M, von Rosenstiel IA, Schindhelm RK, Brandjes DP, Beijnen JH, Diamant M. Ethnic differences in cardiometabolic risk profile in an overweight/obese paediatric cohort in the Netherlands: a cross-sectional study. Cardiovasc Diabetol. 2009. 8:2.
29. Fessler MB, Massing MW, Spruell B, Jaramillo R, Draper DW, Madenspacher JH, Arbes SJ, Calatroni A, Zeldin DC. Novel relationship of serum cholesterol with asthma and wheeze in the United States. J Allergy Clin Immunol. 2009. 124:967–974.e1-15.
30. Fabbri LM, Luppi F, Beghé B, Rabe KF. Complex chronic comorbidities of COPD. Eur Respir J. 2008. 31:204–212.
31. Cazzola M, Calzetta L, Bettoncelli G, Novelli L, Cricelli C, Rogliani P. Asthma and comorbid medical illness. Eur Respir J. 2011. 38:42–49.
32. Mokdad AH, Ford ES, Bowman BA, Dietz WH, Vinicor F, Bales VS, Marks JS. Prevalence of obesity, diabetes, and obesity-related health risk factors, 2001. JAMA. 2003. 289:76–79.
33. Appleton SL, Ruffin RE, Wilson DH, Taylor AW, Adams RJ. Asthma is associated with cardiovascular disease in a representative population sample. Obes Res Clin Pract. 2008. 2:91–99.
34. Rana JS, Mittleman MA, Sheikh J, Hu FB, Manson JE, Colditz GA, Speizer FE, Barr RG, Camargo CA Jr. Chronic obstructive pulmonary disease, asthma, and risk of type 2 diabetes in women. Diabetes Care. 2004. 27:2478–2484.
35. de Marco R, Cerveri I, Bugiani M, Ferrari M, Verlato G. An undetected burden of asthma in Italy: the relationship between clinical and epidemiological diagnosis of asthma. Eur Respir J. 1998. 11:599–605.