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DESCRIPTION: PK model
  Simple linear one compartment PK model with 1st order absorption.
; =============================================

  [LONGITUDINAL]

  input = {ka,CL,Vc}
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PK:
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  ; Model parameters
  ; ----------------
  Tlag1 = 0  ; (hour) Lagtime for INPUT1

  ; Model compartments
  ; ------------------
  compartment(cmt=1, amount=Ac)

  ; Model dosing
  ; ------------
  absorption(cmt=1, type=1, ka=ka, p=1, Tlag=Tlag1)

  ; Transfer and elimination definitions
  ; ------------------------------------
  elimination(cmt=1, k=-(-(CL/Vc)))

  ; Output variables
  ; ----------------
  Cc = Ac/Vc

; =============================================
OUTPUT:
; =============================================

  output = {Cc}