function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aguilar-Camacho, Jose Maria & Carballo, José Luis', 1],
    ['Calcinai, Barbara & Pansini, Maurizio', 1],
    ['Dinn, Curtis & Edinger, Evan & Leys, Sally P.', 2],
    ['Goodwin, Claire & Brickle, Paul', 2],
    ['Goodwin, Claire E. & Berman, Jade & Hendry, Katharine R.', 2],
    ['Göcke, Christian & Janussen, Dorte', 2],
    ['Morozov, Grigori & Sabirov, Rushan & Zimina, Olga', 2],
    ['Schejter, Laura & Cristobo, Javier & Ríos, Pilar', 2],
    ['Van Soest, Rob W. M.', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);