function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Balushkin, A. V.', 1],
    ['DeWitt, H. H. & Hureau, Jean-Claude', 1],
    ['DeWitt, H. H. & Tyler, James C.', 1],
    ['Dollo, L.', 1],
    ['Fischer, J. G.', 1],
    ['Kuzmina, T. A. & Salganskiy, O. O. & Vishnyakova, K. O.', 6],
    ['Laan, Richard Van Der & Eschmeyer, William N. & Fricke, Ronald', 1],
    ['Miller, R. G. & Reseck, J.', 1],
    ['Nybelin, O.', 2],
    ['Regan, C. T.', 1],
    ['Shandikov, G. A.', 3],
    ['Vaillant, L. L.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);