indirect first order inhibition effect model. Effect E is calculated using an differential equation

                        c  

E' = kIn - kOut*(1 - ---------)*E

                      c + c50

where c is the free concentration (either tissue or blood/plasma, depending on the switch) at the BloodTissueConcentrationPort connector.

c50 - concentration producing 50% maximum inhibition

Boolean cBSwitch - false: use tissue free conc, true: use blood free conc