[1] L. A. Perlman, D., & Peplau, Encyclopedia of mental health(Vol. 2, pp. 571-581). Loneliness. In H. Friedman (Ed.). San Diego, CA: Academic Press., 1998.
[2] K. YANG and C. VICTOR, “Age and loneliness in 25 European nations,” Ageing Soc., vol. 31, no. 8, pp. 1368–1388, 2011.
[3] A. D. Ong, B. N. Uchino, and E. Wethington, “Loneliness and Health in Older Adults: A Mini-Review and Synthesis.,” Gerontology, vol. 62, no. 4, pp. 443–449, 2016.
[4] C. Wrzus, M. Hanel, J. Wagner, and F. J. Neyer, “Social network changes and life events across the life span: a meta-analysis.,” Psychol. Bull., vol. 139, no. 1, pp. 53–80, Jan. 2013.
[5] J. de Jong Gierveld and B. Havens, “Cross-national comparisons of social isolation and loneliness: introduction and overview.,” Can. J. Aging, vol. 23, no. 2, pp. 109–113, 2004.
[6] K. S. Rook, “Research on social support, loneliness, and social isolation: Toward an integration.,” Rev. Personal. Soc. Psychol., vol. 5, pp. 239–264, 1984.
[7] L. Dahlberg, L. Andersson, K. J. McKee, and C. Lennartsson, “Predictors of loneliness among older women and men in Sweden: A national longitudinal study.,” Aging Ment. Health, vol. 19, no. 5, pp. 409–417, 2015.
[8] J. Cohen-Mansfield, H. Hazan, Y. Lerman, and V. Shalom, “Correlates and predictors of loneliness in older-adults: a review of quantitative results informed by qualitative insights.,” Int. psychogeriatrics, vol. 28, no. 4, pp. 557–576, Apr. 2016.
[9] P. A. Dykstra and J. de Jong Gierveld, “Differential indicators of loneliness among elderly. The importance of type of partner relationship, partner history, health, socioeconomic status and social relations,” Tijdschr. Gerontol. Geriatr., vol. 30, no. 5, pp. 212–225, Oct. 1999.
[10] C. Ó. Luanaigh and B. A. Lawlor, “Loneliness and the health of older people,” Int. J. Geriatr. Psychiatry, vol. 23, no. 12, pp. 1213–1221, Jun. 2008.
[11] C. R. VICTOR, S. J. SCAMBLER, A. N. N. BOWLING, and J. BOND, “The prevalence of, and risk factors for, loneliness in later life: a survey of older people in Great Britain,” Ageing Soc., vol. 25, no. 6, pp. 357–375, 2005.
[12] L. Dahlberg and K. J. McKee, “Correlates of social and emotional loneliness in older people: evidence from an English community study.,” Aging Ment. Health, vol. 18, no. 4, pp. 504–514, May 2014.
[13] J. Cohen-Mansfield and A. Parpura-Gill, “Loneliness in older persons: a theoretical model and empirical findings.,” Int. psychogeriatrics, vol. 19, no. 2, pp. 279–294, Apr. 2007.
[14] A. Richard, S. Rohrmann, C. L. Vandeleur, M. Schmid, J. Barth, and M. Eichholzer, “Loneliness is adversely associated with physical and mental health and lifestyle factors: Results from a Swiss national survey.,” PLoS One, vol. 12, no. 7, p. e0181442, 2017.
[15] L. C. Hawkley, R. A. Thisted, C. M. Masi, and J. T. Cacioppo, “Loneliness predicts increased blood pressure: 5-year cross-lagged analyses in middle-aged and older adults.,” Psychol. Aging, vol. 25, no. 1, pp. 132–141, Mar. 2010.
[16] E. Courtin and M. Knapp, “Social isolation, loneliness and health in old age: a scoping review.,” Health Soc. Care Community, vol. 25, no. 3, pp. 799–812, May 2017.
[17] C. M. Perissinotto, I. Stijacic Cenzer, and K. E. Covinsky, “Loneliness in older persons: a predictor of functional decline and death.,” Arch. Intern. Med., vol. 172, no. 14, pp. 1078–1083, Jul. 2012.
[18] R. S. Tilvis, V. Laitala, P. E. Routasalo, and K. H. Pitkala, “Suffering from loneliness indicates significant mortality risk of older people.,” J. Aging Res., vol. 2011, p. 534781, Feb. 2011.
[19] Y. Luo and L. J. Waite, “Loneliness and mortality among older adults in China.,” J. Gerontol. B. Psychol. Sci. Soc. Sci., vol. 69, no. 4, pp. 633–645, Jul. 2014.
[20] V. Roos and H. Klopper, “Older Persons’ Experiences of Loneliness: A South African Perspective,” J. Psychol. Africa, vol. 20, no. 2, pp. 281–289, Jan. 2010.
[21] V. W. Q. Lou and J. W. Ng, “Chinese older adults’ resilience to the loneliness of living alone: a qualitative study.,” Aging Ment. Health, vol. 16, no. 8, pp. 1039–1046, 2012.
[22] M. Heravi-Karimooi, M. Anoosheh, M. Foroughan, M. T. Sheykhi, and E. Hajizadeh, “Understanding loneliness in the lived experiences of Iranian elders.,” Scand. J. Caring Sci., vol. 24, no. 2, pp. 274–280, Jun. 2010.
[23] S. Van Der Geest, “‘They don’t come to listen’: the experience of loneliness among older people in Kwahu, Ghana.,” J. Cross. Cult. Gerontol., vol. 19, no. 2, pp. 77–96, Jun. 2004.
[24] World Health Organization, “Global Health and Ageing,” World Health Organization, 2011.
[25] R. S. Tilvis, P. Routasalo, H. Karppinen, T. E. Strandberg, H. Kautiainen, and K. H. Pitkala, “Social isolation, social activity and loneliness as survival indicators in old age; a nationwide survey with a 7-year follow-up,” Eur. Geriatr. Med., vol. 3, no. 1, pp. 18–22, 2012.
[26] A. M. Prina et al., “Cohort Profile: The 10/66 study.,” Int. J. Epidemiol., vol. 46, no. 2, p. 406–406i, Apr. 2017.
[27] A. M. Prina, R. Mayston, Y.-T. Wu, and M. Prince, “A review of the 10/66 dementia research group.,” Soc. Psychiatry Psychiatr. Epidemiol., vol. 54, no. 1, pp. 1–10, Jan. 2019.
[28] M. Prince et al., “The protocols for the 10/66 dementia research group population-based research programme.,” BMC Public Health, vol. 7, p. 165, Jul. 2007.
[29] J. At et al., “Frailty and the prediction of dependence and mortality in low- and middle-income countries: a 10/66 population-based cohort study.,” BMC Med., vol. 13, p. 138, Jun. 2015.
[30] Z. I. Santini et al., “Social network typologies and mortality risk among older people in China, India, and Latin America: A 10/66 Dementia Research Group population-based cohort study.,” Soc. Sci. Med., vol. 147, pp. 134–143, Dec. 2015.
[31] R. M. Sousa et al., “Contribution of chronic diseases to disability in elderly people in countries with low and middle incomes: a 10/66 Dementia Research Group population-based survey.,” Lancet (London, England), vol. 374, no. 9704, pp. 1821–1830, Nov. 2009.
[32] M. Prince, D. Acosta, H. Chiu, M. Scazufca, and M. Varghese, “Dementia diagnosis in developing countries: a cross-cultural validation study.,” Lancet (London, England), vol. 361, no. 9361, pp. 909–917, Mar. 2003.
[33] J. J. Llibre Rodriguez et al., “Prevalence of dementia in Latin America, India, and China: a population-based cross-sectional survey.,” Lancet (London, England), vol. 372, no. 9637, pp. 464–474, Aug. 2008.
[34] M. Prince et al., “Effects of education and culture on the validity of the Geriatric Mental State and its AGECAT algorithm.,” Br. J. Psychiatry, vol. 185, pp. 429–436, Nov. 2004.
[35] J. P. T. Higgins and S. G. Thompson, “Quantifying heterogeneity in a meta-analysis.,” Stat. Med., vol. 21, no. 11, pp. 1539–1558, Jun. 2002.
[36] K. Yang and C. R. VIictor, “The prevalence of and risk factors for loneliness among older people in China,” Ageing Soc., vol. 28, no. 3, pp. 305–327, 2008.
[37] A. M. Prina, C. P. Ferri, M. Guerra, C. Brayne, and M. Prince, “Prevalence of anxiety and its correlates among older adults in Latin America, India and China: cross-cultural study.,” Br. J. Psychiatry, vol. 199, no. 6, pp. 485–491, Dec. 2011.
[38] A. L. Sosa et al., “Prevalence, distribution, and impact of mild cognitive impairment in Latin America, China, and India: a 10/66 population-based study.,” PLoS Med., vol. 9, no. 2, p. e1001170, Feb. 2012.
[39] L. A. Rico-Uribe, F. F. Caballero, N. Martin-Maria, M. Cabello, J. L. Ayuso-Mateos, and M. Miret, “Association of loneliness with all-cause mortality: A meta-analysis.,” PLoS One, vol. 13, no. 1, p. e0190033, 2018.
[40] J. Holt-Lunstad, T. B. Smith, M. Baker, T. Harris, and D. Stephenson, “Loneliness and social isolation as risk factors for mortality: a meta-analytic review.,” Perspect. Psychol. Sci., vol. 10, no. 2, pp. 227–237, Mar. 2015.
[41] L. C. Kobayashi and A. Steptoe, “Social Isolation, Loneliness, and Health Behaviors at Older Ages: Longitudinal Cohort Study.,” Ann. Behav. Med., vol. 52, no. 7, pp. 582–593, May 2018.
[42] L. C. Hawkley and J. T. Cacioppo, “Loneliness matters: a theoretical and empirical review of consequences and mechanisms.,” Ann. Behav. Med., vol. 40, no. 2, pp. 218–227, Oct. 2010.
[43] B. N. Uchino, “Social support and health: a review of physiological processes potentially underlying links to disease outcomes.,” J. Behav. Med., vol. 29, no. 4, pp. 377–387, Aug. 2006.
[44] W. Zhang, L. Liu, F. Tang, and X. Dong, “Social Engagement and Sense of Loneliness and Hopelessness: Findings From the PINE Study.,” Gerontol. Geriatr. Med., vol. 4, p. 2333721418778189, 2018.
[45] N. Agyeman et al., “‘When someone becomes old then every part of the body too becomes old’: Experiences of living with dementia in Kintampo, rural Ghana.,” Transcult. Psychiatry, p. 1363461519847054, May 2019.
[46] R. Mayston et al., “A journey without maps—Understanding the costs of caring for dependent older people in Nigeria, China, Mexico and Peru,” PLoS One, vol. 12, no. 8, p. e0182360, 2017.
[47] S. Shiovitz-Ezra and L. Ayalon, “Use of Direct Versus Indirect Approaches to Measure Loneliness in Later Life,” Res. Aging, vol. 34, no. 5, pp. 572–591, Dec. 2011.
[48] World Health Organization, “World report on ageing and health. ISBN: 9789241565042,” World Health Organization, 2015.