Please choose the correct ending to complete the given sentence: Health: [header] How to prevent leukemia in children [title] Keep your child away from high doses of radiation. [step] Studies show that people exposed to a high dose of radiation are at risk for leukemia. A classic example is the hiroshima bombing survivors.

Ending1: Children are especially susceptible to radiation poisoning when combined with other long-term illnesses, including cancer and reye's syndrome. [substeps] Make sure that your child is protected from radiation exposure by limiting the amount of activity they do (such as running, playing, etc. Ending2: The days and nights high for children are often months long. The numbers do not change much when being exposed to radiation for your child. Ending3: Their exposure to atomic bomb radiation increased their chances of getting leukemia dramatically. [substeps] Even low doses of radiation in x-rays, ct scans, or radiotherapy increase chances of developing leukemia. Ending4: This bombing destroys 3 cities and 3 parts of the united states. It is also known as the one sided nuclear strike.

Answer format: ending1/ending2/ending3/ending4