1. Romero V, Akpinar H, Assimos DG. Kidney stones: a global picture of prevalence, incidence, and associated risk factors. Rev Urol. 2010;12(2–3):e86–96.
2. Stamatelou KK, Francis ME, Jones CA, Nyberg LM, Curhan GC. Time trends in reported prevalence of kidney stones in the United States: 1976–19941. Kidney Int. 2003;63(5):1817–23.
3. Ngugi P, Magoha G, Kiptoon D. Urolithiasis in Nairobi, Kenya. East Afr Med J. 2010;87(10):395–9.
4. Oliech J, Kayima J, Otieno L. Urinary tract stone disease in Nairobi. East Afr Med J. 1998;75(1):30–4.
5. Mkony C. Urinary stone disease in Tanzania: an insight into the magnitude of the problem. East Afr Med J. 1993;70(9):565–7.