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The PubMed entry for the paper:

L<http://www.ncbi.nlm.nih.gov/pubmed/8416322?ordinalpos=&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.SmartSearch&log$=citationsensor>

=head1 FUNCTIONS

=head2 ptp

Accepts a reference to a hash with parameters and returns a scalar 
which denotes the pre-test probability of coronary artery disease.
Note that the value is rounded upwards.

Required parameters include:

    sex : 'male' or 'female'
    age : numerical age of patient
    
Optional parameters

    chest_pain     : 'typical' or 'atypical'