Y. J. Han, S. Y. Ock, E. J. Kim, H. S. Shin, Y. S. Jung, and H. Rim, “Thunderclap-like headache triggered by micturition and angina as an initial manifestation of bladder pheochromocytoma: a case report”, Sao Paulo Med J, vol. 133, no. 2, pp. 154–159, Mar. 2015.