function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becherer', 2],
    ['Chen, Ronglian & Zhang, Faqi & Chen, Shilong & Chi, Xiaofeng', 2],
    ['Compton, James & Skinner, Mark W.', 3],
    ['Compton, James A.', 7],
    ['Compton, James A. & Sytin, Andrej K.', 2],
    ['Fiorito, Serena & Epifano, Francesco & Preziuso, Francesca', 1],
    ['Gao, Yun-Dong & Gao, Xin-Fen', 3],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 4],
    ['Info Flora', 4],
    ['Jarvis, Charlie', 8],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 4],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 5],
    ['Linnaeus, Carolus', 7],
    ['Rešetnik, Ivana & Bogdanović, Sandro', 2],
    ['Thornhill, Robert & Krings, Alexander & Lindbo, David', 2],
    ['Other (5)', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=61)',
    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);