Discontinuation of primary and secondary Toxoplasma gondii prophylaxis is safe in HIV-infected patients after immunological restoration with highly active antiretroviral therapy: results of an open, randomized, multicenter clinical trial - Miro JM, Lopez JC, Podzamczer D, Peña JM, Alberdi JC, Martínez E, Domingo P, Cosin J, Claramonte X, Arribas JR, Santín M, Ribera E, GESIDA 04/98 Study Group (Clinical Infectious Diseases, 2006)