function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Amorim, Dalton De Souza & Oliveira, Sarah Siqueira', 1],
    ['Banamar, Ouarda & Chandler, Peter J. & Driauach, Ouafaa', 2],
    ['Chandler, Peter J.', 4],
    ['Harrison, Roy A.', 1],
    ['Kurina, Olavi', 10],
    ['Kurina, Olavi & Õunap, Erki', 17],
    ['Marshall, P.', 2],
    ['Plassmann, Eberhard', 1],
    ['Tonnoir, A. L. & Edwards, Frederick Wallace', 31],
    ['Zaitzev, Alexander I.', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=75)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);