function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 20],
    ['Chen, Ronglian & Zhang, Faqi & Chen, Shilong & Chi, Xiaofeng', 36],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 29],
    ['Info Flora', 36],
    ['Jarvis, Charlie', 71],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 27],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 39],
    ['Linnaeus, Carolus', 35],
    ['Qi, Zhechen & Li, Pan & Fu, Chengxin', 13],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 31],
    ['Royen, Pieter van', 14],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 26],
    ['Tojibaev, Komiljon & Dekhkonov, Davron & Ergashov, Ibrokhimjon', 41],
    ['Zarrei, Mehdi & Wilkin, Paul & Chase, Mark W.', 35],
    ['Zarrei, Mehdi & Wilkin, Paul & Ingrouille, Martin J.', 22],
    ['Other (71)', 162]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=637)',
    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);