function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Beccari, Odoardo', 6],
    ['Burret, Max', 4],
    ['Heatubun, Charlie D.', 8],
    ['Heatubun, Charlie D. & Iwanggin, Marthinus P.', 1],
    ['Henderson, Andrew & Ban, Ninh Khac & Thanh, Bui Van', 2],
    ['Jarvis, Charlie', 1],
    ['Mehmud, Selim & Roy, Himu', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=25)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);