What makes a 97-year-old man cycle 5,000 km a year? - Cheng, S; Degens, H; Evans, M; Cheng, S M; Selänne, H; Rittweger, J; Heinonen, A; Suominen, H; Strandberg, T; Alen, M; Korhonen, M T (Gerontology, 2016)