22. Pensri P, Janwantanakul P, Chaikumarn M. Prevalence
of self-reported musculoskeletal symptoms in
salespersons. Occup Med (Lond). 2009; 59(7): 499-501.
23. Rothbart BA, Estabrook L. Excessive pronation: a
major biomechanical determinant in the development of
chondromalacia and pelvic lists. J Manipulative Physiol
Ther. 1988; 11(5): 373-9.
24. Gross KD, Felson DT, Niu J, Hunter DJ, Guermazi A,
Roemer FW, et al. Association of flat feet with knee
pain and cartilage damage in older adults. Arthritis Care
Res (Hoboken). 2011; 63(7): 937-44.Posture. 2012; 35(2): 301-7.