function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Calonje, Michael & Betancur, Julio & Lindstrom, Anders', 1],
    ['Calonje, Michael & Hernández, Jonatan Castro', 2],
    ['Haynes, Jody L. & Schutzman, Bart', 2],
    ['Jarvis, Charlie', 1],
    ['Lindström, Anders J. & Idárraga, Álvaro', 1],
    ['Segalla, Rosane & Calonje, Michael', 1],
    ['Segalla, Rosane & Pimenta, Ricardo Soares & Calonje, Michael', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=9)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);