Phenylalanine is a potential novel marker for radiographic knee osteoarthritis progression: the most study. (April 2019) - Zhai, G.; Sun, X.; Randell, E.; Liu, M.; Wang, N.; Tolstykh, I.; Rahman, P.; Torner, J.; Lewis, C.E.; Nevitt, M.C.; Guermazi, A.; Roemer, F.; et al.