function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bacchetta, Gianluigi & Brullo, Salvatore & Congiu, Angelino', 2],
    ['Cronk, Quentin C. B.', 1],
    ['Erst, Andrey S. & Boltenkov, Eugeny V. & Pendry, Colin', 1],
    ['Erst, Andrey S. & Shaulo, Dmitry N. & Baasanmunkh, Shukherdorj', 2],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 6],
    ['Info Flora', 4],
    ['Jarvis, Charlie', 3],
    ['Jeanmonod, Daniel & éd.', 1],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 4],
    ['Linnaeus, Carolus', 3],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=28)',
    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);