function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bassi, Graziano', 10],
    ['Bassi, Graziano & Trematerra, Pasquale', 1],
    ['Clemens, Brackenridge', 2],
    ['Fabricius, Johann Christian', 1],
    ['Gumhalter, Danijela & Kučinić, Mladen & Šašić, Martina', 4],
    ['Mbata, Keith J. & Prins, Jurate De', 1],
    ['Meyrick, Edward', 7],
    ['Sinev, Sergey Yu. & Korb, Stanislav K.', 3],
    ['Singh, Navneet & Ranjan, Rahul & Talukdar, Avishek', 7],
    ['Swezey, O. H.', 1],
    ['Yepishin, Viktor & Khalaim, Yevhenii & Budashkin, Yuriy', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=39)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);