World Health Organization (2002) Active Ageing: A Policy Framework. Geneva: World Health Organization.
Rechel, B, et al. (2013) Ageing in the European Union. The Lancet
Yoshikawa, TT (2000) Epidemiology and unique aspects of aging and infectious diseases. Clinical Infectious Diseases
Derhovanessian, E, Larbi, A and Pawelec, G (2009) Biomarkers of human immunosenescence: impact of cytomegalovirus infection. Current Opinion in Immunology
Strausbaugh, LJ (2001) Emerging health care-associated infections in the geriatric population. Emerging Infectious Diseases
Anon (2014) Report from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions on the Implementation, Results and Overall Assessment of the 2012 European Year for Active Ageing and Solidarity Between Generations. Brussels: Council of the European Union.
Hamrick, N, Cohen, S and Rodriguez, MS (2002) Being popular can be healthy or unhealthy: stress, social network diversity, and incidence of upper respiratory infection. Health Psychology
Cohen, S, et al. (1997) Social ties and susceptibility to the common cold. JAMA
Pressman, SD, et al. (2005) Loneliness, social network size, and immune response to influenza vaccination in college freshmen. Health Psychology
Stein, ML, et al. (2014) Comparison of contact patterns relevant for transmission of respiratory pathogens in Thailand and the Netherlands using respondent-driven sampling. PLoS ONE
Mossong, JL, et al. (2008) Social contacts and mixing patterns relevant to the spread of infectious diseases. PLoS Medicine
Uchino, BN, Cacioppo, JT and Kiecolt-Glaser, JK (1996) The relationship between social support and physiological processes: a review with emphasis on underlying mechanisms and implications for health. Psychological Bulletin
Gallant, MP (2003) The influence of social support on chronic illness self-management: a review and directions for research. Health Education & Behavior
Valente, TW (2012) Network interventions. Science
Webel, AR, et al. (2010) A systematic review of the effectiveness of peer-based interventions on health-related behaviors in adults. American Journal of Public Health
Hovi, T, et al. (2016) Development of a prognostic model based on demographic, environmental and lifestyle information for predicting incidences of symptomatic respiratory or gastrointestinal infection in adult office workers. Trials
Schram, M, et al. (2014) The Maastricht study: an extensive phenotyping study on determinants of type 2 diabetes, its complications and its comorbidities. European Journal of Epidemiology
McCallister, LFC (1978) A procedure for surveying personal networks. Sociological Methods and Research
van der Gaag, M (2005) Measurement of Individual Social Capital. ICS dissertation, Groningen.
Brooks, R (1996) Euroqol: the current state of play. Health Policy (Amsterdam, Netherlands)
Kroenke, K, Spitzer, RL and Williams, JB (2001) The PHQ-9: validity of a brief depression severity measure. Journal of General Internal Medicine
Sheehan, DV, et al. (1998) The Mini-International Neuropsychiatric Interview (M.I.N.I.): the development and validation of a structured diagnostic psychiatric interview for DSM-IV and ICD-10. The Journal of Clinical Psychiatry
59(Suppl 20), 22–33; quiz 34–57.
Folstein, MF, Folstein, SE and McHugh, PR (1975) ‘Mini-mental state’. A practical method for grading the cognitive state of patients for the clinician. Journal of Psychiatric Research
Loeb, M, et al. (1999) Risk factors for pneumonia and other lower respiratory tract infections in elderly residents of long-term care facilities. Archives of Internal Medicine
Kiecolt-Glaser, JK and Glaser, R (2002) Depression and immune function: central pathways to morbidity and mortality. Journal of Psychosomatic Research
van Kuijk, SM, et al. (2016) Bias in regression coefficient estimates when assumptions for handling missing data are violated: a simulation study. Epidemiology, Biostatistics and Public Health
Van Buuren, S (2012) Flexible Imputation of Missing Data. CRC Press.
Akaike, H (1973) Information theory and an extension of the maximum likelihood principle. In Petrov, BN and Csaki, F (eds). 2nd International Symposium on Information Theory. Budapest: Akademia Kiado, pp. 267–281.
Altman, DG and Royston, P (2000) What do we mean by validating a prognostic model?
Statistics in Medicine
Steyerberg, E (2008) Clinical Prediction Models: A Practical Approach to Development, Validation, and Updating. New York: Springer Science & Business Media.
Bleeker, S, et al. (2003) External validation is necessary in prediction research: a clinical example. Journal of Clinical Epidemiology
Shanas, E (1979) The family as a social support system in old age. The Gerontologist
Miyazaki, T, et al. (2005) Association between perceived social support and Th1 dominance. Biological Psychology
Lutgendorf, SK, et al. (2005) Social support, psychological distress, and natural killer cell activity in ovarian cancer. Journal of Clinical Oncology
Rose, G (2001) Sick individuals and sick populations. International Journal of Epidemiology
Royston, P, Altman, DG and Sauerbrei, W (2006) Dichotomizing continuous predictors in multiple regression: a bad idea. Statistics in Medicine
Stein, ML, et al. (2014) Online respondent-driven sampling for studying contact patterns relevant for the spread of close-contact pathogens: a pilot study in Thailand. PLoS ONE
Harrell, F (2015) Regression Modeling Strategies: With Applications to Linear Models, Logistic and Ordinal Regression, And Survival Analysis. New York: Springer.
van Gageldonk-Lafeber, AB, et al. (2005) A case-control study of acute respiratory tract infection in general practice patients in The Netherlands. Clinical Infectious Diseases
Hardy, MA and Bryman, A (2009) Handbook of Data Analysis. London: SAGE Publications.