\begin{tikzpicture} \begin{pgfonlayer}{nodelayer} \node [style=emptyBox] (0) at (-18.5, 4) {Compound Safety}; \node [style=emptyBox] (1) at (-18.5, -3.5) {Compound Effectiveness}; \node [style=Red Box] (3) at (-3.75, -3.5) {\begin{tabular}{l} Conclusion \\ $\bullet$ Status\\ $\bullet$ Duration \\ $\bullet$ Enrollment \end{tabular}}; \node [style=Red Box] (4) at (-2.75, 1) {\begin{tabular}{l} Snapshot \\ $\bullet$ Status\\ $\bullet$ Duration \\ $\bullet$ Enrollment \end{tabular}}; \node [style=Red Box] (5) at (3.25, -2) {Market Conditions}; \node [style=Box] (6) at (-17.5, -5.5) {Sponsor Changes}; \node [style=Box] (7) at (-15.25, 0.25) {\begin{tabular}{l}Prior \\ Trials \end{tabular}}; \node [style=emptyBox] (8) at (-2.25, 4) {Beliefs about Compound}; \node [style=emptyBox] (10) at (3.25, -5.25) {Unobserved}; \node [style=Box] (11) at (3.25, -6.25) {Observed: Control}; \node [style=Red Box] (12) at (3.25, -7.25) {Observed: Of interest}; \node [style=emptyBox] (13) at (-11, 4) {Adverse Events}; \node [style=emptyBox] (14) at (-10.5, -1.5) {Measured Effectiveness}; \node [style=Box] (15) at (3.75, 1) {Disease Burden}; \end{pgfonlayer} \begin{pgfonlayer}{edgelayer} \draw [style=RightArrow] (4) to (3); \draw [style=RightArrow] (5) to (3); \draw [style=Light Arrow] (0) to (7); \draw [style=Light Arrow] (1) to (7); \draw [style=Light Arrow] (7) to (8); \draw [style=Light Arrow] (8) to (4); \draw [style=Light Arrow] (6) to (3); \draw [style=Light Arrow] (0) to (13); \draw [style=Light Arrow] (13) to (3); \draw [style=Light Arrow] (1) to (14); \draw [style=Light Arrow] (14) to (3); \draw [style=Light Arrow] (15) to (5); \draw [style=Light Arrow] (15) to (4); \draw [style=RightArrow] (5) to (4); \end{pgfonlayer} \end{tikzpicture}