function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 5],
    ['Brullo, Salvatore & Brullo, Cristian & Cambria, Salvatore', 2],
    ['Brullo, Salvatore & Zimmitti, Angelo', 2],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 2],
    ['D. M. Moore (ed.)', 12],
    ['Elias Landolt', 13],
    ['Fateryga, Alexander V. & Fateryga, Valentina V.', 3],
    ['H. E. Hess & E. Landolt & R. Hirzel', 6],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 6],
    ['Info Flora', 15],
    ['Jarvis, Charlie', 4],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 12],
    ['Kubentayev, Serik A. & Efimov, Petr G. & Alibekov, Daniyar T.', 3],
    ['Ormerod, Paul & Kurzweil, Hubert & Watthana, Santi', 3],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 1],
    ['Other (1)', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=90)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);