A generic stock and flow map of Cancer Screening and Treatment. See also IM-1525 for a specific Prostate PSA Map and Reference  See IM-107014 for a more detailed prostate cancer specific map 

Based on Ransohoff DF, McNaughton Collins M, Fowler FJ. Why is prostate cancer screening so common when the evidence is so uncertain? A system without negative feedback. Am J Med. 2002;113:663-7. See IM-15991 for a generic Stock Flow Map

Insight synthesis of exchanges to better understand the basis of this decision. Unstructured additions from GMcD

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Bugs have a life cycle. The population of the bugs can be controlled by destroying the stocks of eggs/nymphs/adults or by controlling the rate at which they lay eggs, the rate of hatching of the eggs and the rate at which the nymphs become adults. The growth also depends on the time taken for eggs to hatch and for the nymphs to become adults. Some of the control strategies could also be to increase this time. The effectiveness of these strategies differs and the model lets you evaluate them

A generic stock and flow map of Cancer Screening and Treatment. See also IM-1525 for a specific Prostate PSA Map and Reference  See IM-107014 for a more detailed prostate cancer specific map