# http://www.graphviz.org/content/cluster
digraph G {
    layout = neato;
    Asymptomatic [pos="0,0!"];
    "Progressive\nDisease" [pos="2,1!"]; 
    Dead [pos="1,-1!"]
    "Dead\n(Disease)"[pos="2.5,-1!"]
    Asymptomatic -> Asymptomatic ;
    "Progressive\nDisease" -> "Progressive\nDisease";
    Asymptomatic -> "Progressive\nDisease" [label="tpProg * (1-effect)"]; 
    "Progressive\nDisease" -> "Dead\n(Disease)" [label="      tpDcm" fontcolor="black"];
    "Progressive\nDisease" -> "Dead" [label="    tpDn" fontcolor="black"];
    Asymptomatic -> Dead [label="tpDn"];
    "Dead\n(Disease)" -> "Dead\n(Disease)"
    Dead -> Dead ;
}