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Du Puy, R S; Postmus, I; Stott, D J; Blum, Manuel; Poortvliet, R K E; Den Elzen, W P J; Peeters, R P; van Munster, B C; Wolffenbuttel, B H R; Westendorp, R G J; Kearney, P M; Ford, I; Kean, S; Messow, C M; Watt, T; Jukema, J W; Dekkers, O M; Smit, J W A; Rodondi, Nicolas; Gussekloo, J; ... (2018). Study protocol: a randomised controlled trial on the clinical effects of levothyroxine treatment for subclinical hypothyroidism in people aged 80 years and over. BMC Endocrine Disorders, 18(1), p. 67. BioMed Central 10.1186/s12902-018-0285-8
Dekkers, O M; von Elm, E; Algra, A; Romijn, J A; Vandenbroucke, J P (2010). How to assess the external validity of therapeutic trials: a conceptual approach. International journal of epidemiology, 39(1), pp. 89-94. Oxford: Oxford University Press 10.1093/ije/dyp174
