Temporal association between serious bleeding and immunization: vitamin K deficiency as main causative factor oleh Susi Susanah, Eddy Fadlyana, Meita Dhamayanti, Rodman Tarigan, Eko Fuji Ariyanto, Yunisa Pamela, Yuzar I. B. Ismoetoto, Rita Verita Sri, Monika Hasna, Kusnandi Rusmil