Read the right most boxes in Figure 1 from top to bottom
1	$C_{E} + P_{S} [B (t r e a t m e n t)]$
2	$C_{E} + (1 - P_{S}) P_{S} C_{C}$
3	$C_{E} + (1 - P_{S}) P_{S} [B (n o i n f e c t i o n)]$
4	$C_{E} + [{(1 - P_{S})}^{2} (C_{A})] [(P_{A R}) (C_{A R})]$
5	$C_{E} + [{(1 - P_{S})}^{2} (C_{A})] [(1 - P_{A R}) B (t r e a t m e n t)]$