Howard SC, Gajjar AJ, Cheng C, Kritchevsky SB, Somes GW, Harrison PL, Ribeiro RC, Rivera GK, Rubnitz JE, Sandlund JT, de Armendi AJ, Razzouk BI, Pui CH. Risk factors for traumatic and bloody lumbar puncture in children with acute lymphoblastic leukemia. JAMA. 2002 Oct 23-30; 288(16):2001-7.