1.   The hospital has a private ward for paying patients, and the sympathetic director is using some of the money from it to buy drugs for the sickest children.

2.   The Westerners, he recalled, would mix great batches of porridge, and the sickest children would be too sick to eat it.

3.   The Westerners would mix great batches of porridge, and the sickest children would be too sick to eat it.

4.   Thus, the rules reserve the most invasive research for the sickest children, and allow risky tests only if researchers can show that they might help the children.