function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alcock, Alfred William', 1],
    ['Andréfouët, Serge & Chen, Wei-Jen & Kinch, Jeff & Mana, Ralph', 4],
    ['Bariche, Michel & Fricke, Ronald', 1],
    ['Bennett, Edward Turner', 1],
    ['Bleeker, Pieter', 2],
    ['Ditty, James G. & Malca, Estrella & Vásquez-Yeomans, Lourdes', 1],
    ['Du, Jianguo & Loh, Kar-Hoe & Hu, Wenjia & Zheng, Xinqing', 1],
    ['Gilchrist, J. D. F.', 1],
    ['Golani, Daniel & Bogorodsky, Sergey V.', 1],
    ['Jordan, David Starr & Evermann, Barton Warren', 1],
    ['Matsunuma, Mizuki & Motomura, Hiroyuki', 2],
    ['Montrouzier, X.', 1],
    ['Smith, J. L. B.', 1],
    ['Steindachner, F.', 1],
    ['von Bonde, C.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);