function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 5],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 2],
    ['Chen, Feng & Xiong, Chi & Zheng, Chang-Bing & Jin, Xiao-Hua', 1],
    ['D. M. Moore (ed.)', 6],
    ['Elias Landolt', 8],
    ['H. E. Hess & E. Landolt & R. Hirzel', 4],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 5],
    ['Info Flora', 5],
    ['Jarvis, Charlie', 3],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 3],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 3],
    ['Ormerod, Paul & Kurzweil, Hubert & Watthana, Santi', 3],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=50)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);