text: function MedicationDosage( timing, site, route, method, quantity, rate, maxDosePerPeriod)
  {	
  	if( typeof timing != 'undefined' )
  		this.timing = timing;		 					//Schedule
  	
  	if( typeof site != 'undefined' )
  		this.site = site;								// codeable concept
  	
  	if( typeof route != 'undefined' )
  		this.route = route;								// codeable concept
  	
  	if( typeof method != 'undefined' )
  		this.method = method;							// codeable concept
  	
  	if( typeof quantity != 'undefined' )
  		this.quantity = quantity;						//Quantity
  	
  	if( typeof rate != 'undefined' )
  		this.rate = rate;								//Ratio
  	
  	if( typeof maxDosePerPeriod != 'undefined' )
  		this.maxDosePerPeriod = maxDosePerPeriod;		//Ratio
  }