function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Agudelo, Antonio A. & Rivera, Julio', 1],
    ['Rivera, Julio & Herculano, João Felipe', 1],
    ['Rivera, Julio & Vergara-Cobián, Clorinda', 4],
    ['Roy R.', 2],
    ['Schwarz, Christian J. & Ehrmann, Reinhard & Stiewe, Martin B. D.', 4],
    ['Svenson, Gavin J.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);