function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Fennah, R. G.', 1],
    ['Giffard, Walter M.', 9],
    ['Hoch, Hannelore & Howarth, Frank G.', 3],
    ['Kirkaldy, George Willis', 3],
    ['Luo, Yang & Bourgoin, Thierry & Zhang, Jia-Lin & Feng, Ji-Nian', 6],
    ['Löcker, Birgit & Fletcher, Murray J. & Larivière, Marie-Claude', 22],
    ['Mozaffarian, Fariba', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=45)',
    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);