function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aistleitner, E.', 2],
    ['Fernández Vidal, Eliseo H.', 2],
    ['Guerrero, Juan José & Rubio, Rosa María & Garre, Manuel', 2],
    ['Irungbam, Jatishwor Singh & Fric, Zdeněk Faltýnek', 1],
    ['Knyazev, S. A.', 1],
    ['Manceñido-González, David César', 2],
    ['Rafi, Muhammad Ather & Sultan, Amir & Kitching, Ian J.', 1],
    ['Rybalkin, S. A. & Yakovlev, R. V.', 1],
    ['Swezry, O. H.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    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);