chronic lymphatic leukemiaacute lymphatic leukemiaacute lymphatic leukaemialeukaemia cancer symptomslymphocytic leukaemia symptomslymphoblastic leukaemia symptomschronic leukaemia symptomssymptoms of leukaemia in teenagerleukaemia relapse symptomsleukaemia nosebleedssymptoms of leukaemia in elderlyleukaemia petechiae